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Long answer ahead as it included my whole journey of GATE with 2 attempts.I did my B.Tech from Institute of Engineering & Technology, Lucknow(2019). It counts as an average college but the only difference is it is a govt. college so the fees were very less.One of the advantages that I got from college is that its location is near to the Made Easy center.Another advantage was being a govt college so there was not a very strict rule of attendance.I had joined the coaching in my third year and batch was started on 12th June 2017 and continued till November. So after November, I had more than 1 year for the preparation till the exam, since the duration of the coaching classes was very long so I do not get enough time to revise the concepts on daily basis, so I thought I would be better if I just make notes and do the revision after November.The books I followed were:CO -: Computer Organization By Carl Hamacher and notes.Discrete -: Discrete Mathematics and its Applications by Kenneth H. Rosen snd notes.TOC and Compiler -: No books just notes, geeks for geeks, closure properties, and undecidability chart from Gate CSE website and undecidability questions from the following link https://www.cs.rice.edu/~nakhleh/COMP481/final_review_sp06_sol.pdf.Algorithms -: Narasimha Karumanchi and notes.OS -: Galvin, geeks for geeks and notes.CN -: Computer Networks by Forouzan, geeks for geeks and notes.C and DS -: notes.DLD -: geeks for geeks and notes.DBMS -: Korth, geeks for geeks and notesSo I made a plan to complete the syllabus from December till May with two weeks per subject which covers the notes, books if needed, workbook(provided by the coaching), and previous year questions and from June till January revision and test series. But things didn't happen as we plan the strategy was followed till mid of march then I was able to concentrate on studies for 2 and a half months (due to some personal problems).May was marked as the end of the semester and we all were going home so I thought I have 2 months at home use this time as much as you can, by god’s grace I have used this time wisely and completed the remaining syllabus in the due time.From August, I started doing previous year questions from Gate Overflow PDF’s and side by side I have started giving the test series initially I was not getting good marks like if the test was of 25 marks I was getting only 15. but as the time progress, the mistakes reduces, presence of mind improves and marks improved. This time I used to give 1–2 tests daily and my duration of studying was 8–10 hours, the time-division was giving a test then analyze it then do some revision of some other subject and give a test of that subject.To reduce the mistakes in the tests I have followed 2 strategies.Whichever question I do wrong I made a screenshot of the question and whenever I was about to start a new test of that subject I just go through the screenshots so that do not commit the same mistake.In a small booklet, I have made cells like that in an MS excel sheet where each row represents a test and 5 columns which includes mistakes which we can commit like question reading, silly mistake, conceptual mistake, calculation mistake and finally a column of the wrong question just to boost confidence in case the question is wrong. After completing a test I count the no. of questions belonging to each category which I do wrong and write the count in the respecting cells. So now I can find where I am going wrong and this strategy helped me a lot believe me.Till December I continued with Subjects wise tests and from January I started with Full-Length tests, Out of the above 2 strategies first one was not very useful in the full length as the number of screenshots are increasing after every test and was possible to go through after every test so I dropped that idea later on. I have also joined some CBT’s also like ME, ACE, Gate Forum, etc.In the results of full length, I was getting marks in the range of 68–70 and sometimes above 80 if I got lucky.In the CBTs also I scored well In ACE I got 76 marks with rank 9th and in made easy I got 70 marks with rank 50, so I was pretty confident that I will crack GATE 2019 with a rank under 100. ( As my target was masters from IIT Bombay)Now the D-day came and in an exam like GATE after a certain level of preparation, your preparation does not matter only matters is your attitude while giving a paper and some luck but unfortunately, these 2 things were absent on that day.The result came I had secured 64.33 marks with AIR 498, although It sounds a good rank but for me who haven't think of a rank above 100 and had spent 1 and a half year for GATE, had a failed relationship just because of not compromising exam with anything else it matters a lot.I have filled the forms for MTech in the old IIT’s, neither NITs nor MS research except(IIT Kanpur) because I want to do only MTech from the old IIT’s but fate had hit me so hard that I didn’t get the call from MTech from any of them. I got a written exam call from IIT Kanpur for MSR, I thought still there is some chance the written exam, coding round followed by interview was scheduled from 8–10 May and this created a problem my semester exam was on 10 May, I had tried my best to shift my semester exam to some other date and in the end, I succeed. But here also fate had hit me the second time, I was not qualified in the written and coding round for the admission in MSR, in the night while lying in the bed I cried as all my effort of shifting the semester exam gone in vain and thought why me and then I thought of taking the exam again next year.Luckily I got a job through in campus placement in Global Logic, Noida25th June 2019 I marked this day as my failure of not got that I want, I took a screenshot of the last round counseling with empty offers ( bahut shauk tha questions ke screenshots lene ka to iska bhi le liya).Then I started my journey for the next attempt and decided to prepare while doing a job. The first 2 months were of training as after that I need to align in some project so I didn't get time to prepare, from first September I started my preparation my job timing was 9–5 so I prepare from 5 till 8 in the office itself in some corner and 9–12 after returning to PG. So the total was 6 hours out of which 5 hours were effective.The preparation included the revision of a subject followed by the previous year questions of the same from the Gate Overflow PDF’sI didn't follow any books as didn't get much time after job this continued till November and I have completed my first phase of revision. The second phase included test series and making short notes and again revision.The most difficult thing I found during preparation is the clearing of the conceptual doubts, The worst thing about coaching institutes is we can not clear our doubts after the coaching ends it was very difficult to get a reply from the faculty of a single doubt.Luckily while in college I was not the only one who was preparing so the doubts can be easily cleared amongst the other aspirants but here I was alone as all my friends got admission in IIT’s, IISC and PSU’s, so I enrolled in online coaching which is GATE Applied Course because as a student we need someone who can clear out doubts how small it can be and Applied Course had helped me a lot I just mailed them and I got the reply with 24 hours. From December I started giving the test series I enrolled in Made easy and GATE Applied Course tests, from December my office timings had increased by one hour that is from 9 to 6 pm so now my effective duration is reduced to 4–4.5 hours.I followed the same strategy of writing the no. of wrong questions in the booklet as I mentioned earlier and apart from that, I had divided a register into about 10 equal pages for each subject, in which I made short notes for each subject and after giving a test if I commit a conceptual mistake I write it down as a concept. Whenever in the office I get free time I read these short notes.From the second week of January, I started giving the full-length tests initially I got around 65 marks, not because of conceptual mistakes but because of the lack of presence of mind as I read the questions wrongly. How hard I try but I could not get succeed on this bad habit but I only can reduce it, so as the time passes I manage to score around 75+ marksI have enrolled in Made Easy CBT that too in CBT 2, this time which I manage to get 83.33 marks with rank 1.This time also my only target was M.Tech from IIT Bombay and rank under 100, now I was pretty sure that there is a chance that I can get under AIR under 100.Now the second D-day came and as I told earlier in an exam like GATE after a certain level of preparation, your preparation does not matter only matters is your attitude while giving a paper and some luck, this time I had both but not that much I expectedI result came and I had scored 70 marks with AIR 129 not that I expected but still, I was there was an improvement from the previous attempt and that too while doing a job.Luckily this time I have applied for the EWS certificate and according to the previous year cutoff, there was a hope that I got the offer from IIT B. I have applied for the M.tech program IISC, IIT B, IIT D, IIT M, IIT Kgp, IIT K.On the night of 9th June, I got the offer letter from IISC I was on cloud nine as I was not expecting this from IISC, and on the next day, the got the offers from IIT B, IIT M, IIT K, IIT Kgp.That day was the best day of the year 2020, as we know “The best thing about time is it changes”. This quote is very much true in my case.Because for craking an exam we need motivation and there are three main sources of motivation( Money, Respect and Girl) so find yours and stick to it.Due to some personal reasons I choose IISC instead of IIT B and waiting for the first semester to begin.So I have both experiences as a fresher and as a second attempt. I am writing dows the key points while preparing for GATE :Divide your preparation into phases, in phase 1 complete the whole syllabus and stick to the syllabus don't leave any topic in any subject. Questions from any topic can come in the exam.If someone is thinking of getting enroll in coaching then I would suggest for the GATE Applied Course, their doubt clearing support is very remarkable and their tests are better than the other test series.If did sincerely phase 1 can be completed in 4–5 months. don't use A4 sheets to make short notes and stick them on the wall of your room instead make them in a notebook which you can carry anywhere.In phase 2 again revise the notes and after every revision of a subject solve previous year questions of the same.Your short notes should be such that for revising the subjects these notes should be enough you should not need any other material. Phase 2 should be of maximum 2 months.In phase 3 start giving online tests and you can follow my strategy of writing the no. of wrong questions in a booklet.While giving tests whenever you find a new concept write it down in your notebook.Revision is the key, revise the short notes whenever you get time.phase 3 will continue till the GATE exam.Start giving full length from the January or mid-December.There will a time come when you will be bored with the subjects and you will no longer be motivated, just relax as everyone faces these issues I would suggest just don't lose hope find a solid motivation.For those people are preparing with the job and those college students whose colleges have strict attendance rule I can just say that:“If you want to crack GATE very badly, you will find a way for the same, no manager no colleague and no long working hours can stop you from achieving from what you want”Edit: For TOC you can also refer An Introduction to Formal Languages and Automata by Peter Linz.

Long long ago, in a galaxy far far away, there lived an energetic young space commander named Sheriff Sequential. Although he ruled the tiny planet of Pentium Single-Core 1.3ghz, he harbored ambitions of ruling all the planets in the Motherboard, their solar system. Sadly, his inclination to be a one-man army and perform all tasks one step at a time was stopping him from achieving his dream. It was impossible for him to personally defend more than one planet at a time.Disclaimer: This answer is aimed towards people with a CS background grappling with MapReduce concepts, i.e. those who can chuckle at the sight of common operating systems terminology being used in a fairy-tale context. For a short and excellent introduction of MapReduce aimed towards everyone, please refer the other answer: Gautam Singaraju's answer to Intuitive Explanations: What is an intuitive explanation of MapReduce?But the dreamers of the day are dangerous men, and so was our Sheriff, as he set out to turn his dreams into reality. He took a break from his sheriff duties and enrolled in a graduate level course on military strategies for multi-core warfare. Consequently, his eyes opened to a completely different level of the game. He spawned a small army of Warrior Threads and trained each one of them to perform all the tasks necessary to capture and rule a planet. Each Thread was sent off to conquer a different planet, and the Sheriff chuckled in delight as he received messages of his Threads paging-out the poor local sheriff processes on each planet. He started to call himself Commander Concurrent.But if some things have an upper bound, ambition is not one of them. Commander Concurrent now set his sights on ruling the entire galaxy, named Big Data. However, this was an entirely different game of cores. Since the other planets in the galaxy were so far away from each other, his Threads could not hope to share resources between them during their attack missions. Also, many of the planets hosted alien forms of Data which were largely unknown, unstructured and untamed. He knew that all planets had formed small groups to protect their data, and they fought under the same Key, but it was impossible to know beforehand which planet was associated with which Key.Many ancients advised our Commander to build a great army of Specialized Processes that could operate independently on their assigned chunk of the data, analyze its Key, and compute the desired results for victory. But our Commander had the intuition that such an army would be too expensive to build, and it would be impossible to generalize it to future wars. Moreover, each process may not be able to completely process its planet's Data in isolation, and may require collaboration with other nearby processes to vanquish the planets that fought under the same Key. In which case, inter-process communication would be time-consuming.Instead, the Commander embarked on a pilgrimage to the holy planet of Mountain View, where he seeked answers from the sages Dean and Ghemawat. He was not disappointed. Enlightened, he returned back to his home planet, and set about raising an army of two kinds of soldiers: Mappers, who would visit a planet and parse all forms of Data present there to expose their Key, and Reducers, each of whom would scourge the Data left behind by multiple Mappers, and provide a single killing blow to secure victory over all planets fighting under the same Key. Breaking the job into two steps allowed each Mapper to quickly process a single chunk of Data and move over to the next planet, without having to collaborate with other Mappers. A Reducer would come along later and finish the job by terminating all the planets that possessed Data of the same Key. All the while, the Commander would direct his entire army from the comfort of his home planet. This was a powerful idea, whose time had come.The war was on. As his army of Mappers and Reducers systematically ravaged all of Big Data, our Commander renamed himself, Major MapReduce. The war was soon over, and the Major presided over a general meeting of his army. They shared stories of how cool they were to build such a low-cost army based on a powerful idea and defeated the armies that were building super-advanced stuff that wouldn't scale as much.Someone asked our Major, "What next?". He chuckled, and looked upwards at the Cloud.

Sri Shakthi Institute of Engineering and Technology, CoimbatoreThis college can be regarded as the worst college not only in India but also in the entire Universe.Fake Marketing : This year the college authorities claim that a guy had got an offer from Amazon for 27 Lakhs per Annum CTC. The truth is that he didn’t get job. He is currently undergoing “internship” at Amazon. At the end of internship, based on his performance he might be given a Pre-Placement Offer or a Pre-Placement Interview. By the way, even for IIT Delhi Undergraduates, the package given by Amazon was 16 Lakhs per Annum CTC only not 27 Lakhs. (Source : Uber, Amazon, Flipkart rush to IIT Delhi for placements; offer as much as Rs 36.6 lakh annually). Same thing for students placed in Tivo. They aren’t Employees. They are Interns.Collecting extra Fees : Even, if we never broke anything in lab, we have to pay “Lab Breakage” amount for each lab every semester. If you don’t pay, you won’t get hall ticket for the theory exam. Anna University Photocopy fees is 300 Rupees and Revaluation fees is 400 Rupees but they collect extra 100 Rupees(50 for photocopy + 50 for Revaluation) from students who are presently studying here and 200 Rupees(100 for photocopy + 100 for Revaluation) from students who have already completed their 4 years but still having backlogs, in the name of Demand Draft. Anyway they are going to pay on behalf of all students. So, collecting 50/100 Rupees from students would give them a huge profit every semester.Collecting Unnecessary Fines : A lot of parent’s hard earned money is wasted by paying unnecessary fines for silly reasons. If the classroom is little dirty due to papers/chocolate wrappers, the whole class has to pay a fine of 10 rupees each. If there is any ink mark on the table/desk, a huge fine will be imposed on the students who had been sitting there. If any male student is found with his shirt untucked, his ID Card would be seized and to get back his ID Card, he has to pay 50 rupees. If you are wearing sandals instead of shoes, you have to pay huge penalty. Some of the other silly reasons for which ID Card might be seized include the following:Coming late to class by few minutes(even for genuine reasons and unavoidable circumstances)For failing an Internal test.Talking with opposite gender.Under-qualified Faculties : Most of the faculties who join this Institution are themselves from yet another Tier-3 College. Some of them join after completing their Post-Graduation here. Majority of them had never qualified UGC-NET nor GATE. Sometimes, they teach wrong concepts in class. Once in 1st semester, my Physics Teacher told “log(A)*log(B) = log(A+B)”. He holds a PhD Degree in Physics.Bizzare Dress Code for Lab : Students are forced to wear Blue Coloured Lab Dress thrice a week. Sometimes, you have to wear it on Saturday also if a teacher announces that there will be a lab session that day. I don’t understand why all branch students have to wear it. The management just wants to gain money by selling the cloth to it’s students. Remember the cloak which Harry Potter uses to make himself invisible. Similarly, the management thinks that by wearing their Lab Dress, we double our IQ and perform groundbreaking experiments successfully in the Laboratory. But instead it makes the students look completely insane and ridiculous to such an extent that when I was wearing it one day, a guy mistook me for a Security Guard.Improper Teaching Methodology : As, I previously stated, the teachers are under-qualified. Most of them never teach anything in class. They simply dictate notes in class. They also correct the notes of students to check if they are noting down everything what they are dictating. If a topic is difficult, they give it as a seminar to students. There are teachers who give entire chapter as seminar to students. The assignments are usually copy+paste from some book/webpage. There is zero learning from the assignments and Homework. We have to completely rely on NPTEL Videos for studying during Semester exams.Unprofessional Paper Evaluation : If a teacher develops a hatred for a student, then that student gets low internal marks regardless of whether he/she is studious or not. If you are a teacher’s pet and if your handwriting is good, you will be blessed with high internal marks. Once, me and a classmate of mine had got same mark in an Internal test(32/50 or 64%). Here comes the twist, since that classmate was a teacher’s pet, a mark higher than 64% was uploaded in the Anna University Portal but for me the same 64% was uploaded in spite of the fact that I have a better CGPA than that classmate. Also, I have zero history of backlogs but that classmate has history of backlog in one subject. When I confronted this injustice to the teacher, the teacher told me that she had scored more than me in the re-test. I know very well that I had done my re-test pretty good. I’m definitely sure that she had never corrected the re-test papers.Unhygienic Mess food : It is not uncommon to find bugs in your plate when you are eating in the mess. Those insects are more tastier than the crap food they provide.Supplying low quality books : In 1st year, the management collected 10,000 Rupees for books. The books they provided were all written by some local authors. Especially, the mathematics textbook was pretty much non-standard. I don’t know whether the maths professors in my college have read “Introduction to Linear Algebra” by “Gilbert Strang”. It is one of the best books for studying Linear Algebra. Instead, they provided a book from a local publisher.Useless Value Added Courses : Despite the hectic curriculum, students are forced to study completely irrelevant extra courses in addition to Anna University syllabus, named as “Value Added Courses”. In the 1st semester all the branch students are forced to study “Hardware and Networking” course. For Computer Science Students, it is okay to study that but for Mechanical Engineering Students, it is totally irrelevant and useless. Also, when there are so much beautiful courses like “Machine Learning”, “Human Computer Interaction”, “Data Science”, “Natural Language Processing”, “Pattern Recognition”, etc… the 2nd year Computer Science Students are taught “Web Designing”. They even collected 1800 Rupees for that course. They called few people from a local coaching institute and asked them to teach. It was a complete waste of time and money for the students. They just taught some basic HTML and CSS, which was already learnt in highschool.Rude Teachers : Many teachers especially the former Director “Manian” used to treat students like slaves. Sometimes, Manian even hit and slap the students even for some small mistake. He pulls the student by his ear, shouts and slaps his cheek violently. If you are found talking while walking to the exam hall, he tears the hall ticket into pieces and breaks your ID Card. You have to pay a huge fine for getting a new hall ticket and temporary ID Card. As per Anna University rules, a student should enter the exam hall at-least 10 minutes before the commencement of exam, but they ring the bell 30 minutes before the commencement of exam. If you didn’t go inside the Academic Building 10 minutes after the bell has rung (that is 20 minutes before the commencement of Exam) , the building will be locked and you will not be allowed to enter the academic building till 15 minutes has passed by after the exam has started. After opening the door, Manian shouts and lectures how irresponsible we are, by not being punctual on the exam day. This increases the stress levels before the exam. No extra time will be given. Thus, you may end up not being able to complete the paper on time. Once in 2nd semester, a chemistry teacher seized the phones of those students who were unprepared for a test.No choice for Electives : Unlike IITs and IISC where you are free to choose the subjects for a semester, here even there is no choice for electives. The whole class has to study the same elective subject, which the teachers will decide.Forcing the students to fill positive review in any feedback/survey : The management never collects feedback anonymously. We have to enter our name and Register number in the feedback form. So, they know who has filled what review. Often, all students fill positive review about a faculty, as we fear that they could award low Internal marks in the upcoming semesters. Recently, we were asked to fill NAAC Student Survey form. We were asked(Read forced) not to give any low points/Rating about the Institute in the survey.Outmoded Software in Lab : Some of the systems in the labs still use Windows XP. Please, don’t insert your USB onto any system. All sorts of malware and virus would enter in case you did.Bulky Record Notes : Have you ever found any IIT student writing pages and pages of observation note and copy the same in Record note as a part of any laboratory course. Here you are forced to do that. If you submit only your Record note instead of submitting both your observation and record note, your internal marks will be reduced. We never do most of the experiments in lab due to lack of equipment. During the practical exam if you are a teacher’s pet and even if you never performed the experiment you will still get S grade. One of my record note has around 400 pages in it.Torturing students before signing in the No dues form : Regardless of whether you are a topper or a student with many history of backlogs, the teachers are so sadistic that they make you write many tests and assignments before signing in the no dues form. Some teachers might even seize your Hall ticket before their respective exam if he/she thinks that you aren’t prepared. As a result your exam fees of 150 Rupees gets wasted and you end up getting a backlog.Lack of Holidays : At most you get 2 weeks of holidays as a Semester Vacation. The college reopens before the prescribed date of Anna University. If you are absent during this time, you will be punished severely. Once a group of 2nd year Computer Science students were absent for 2 days during this time. When they came back to college, they were made to stand outside the class for one whole day(from 8:30 am to 4:30 pm). They even conduct class on public holidays and Sundays in the name of completing the syllabus. If you are absent,you have to face huge consequences. Also, most of the Saturdays will be working days although they claim that only odd Saturdays of a month are working days.Treating students as Elementary School kids : Almost all students except few 1st year students are adults(age>=18). But the teachers treat students like 10 year old kids. For any small mistake you commit, your class advisor calls your parents and informs them. If you get a backlog in a subject, you have to bring your parents to meet the respective teacher.Poor Quality of Students : Some students are highly unmotivated. They are forced by their parents to study Engineering despite them having zero interest in it. They end up getting huge history of backlogs thus making them ineligible for Campus placements. They eventually end up without a job at the end of 4 years. Some students are Bullies. They shout at the top of their lungs. Every time they speak, they use the words which are tamil equivalent of madarc**d, behenc**d, chut**a, etc… People of different departments never forget to involve in fight whenever they get the chance. Also, it is easy for your valuable things like mobile, wallet, Record note, etc… to get stolen.No freedom to park vehicles outside the campus : The college authorities collect a huge parking fee from students for parking the vehicles inside the campus. In-order to avoid this, few students park the vehicles outside the campus in a nearby area. Once in August 2016, there was a protest because the management had punctured the wheels of few vehicles which were parked in front of a bakery adjacent to the campus.No freedom to go outside the campus between 8:30 am to 4:30 pm : If you want to take any print out or photocopy or if you want to eat in a hotel outside the campus, you have to either give your ID Card or provide an out pass. Once, I had to attend an interview, so I had to go outside the campus. The security didn’t let me out. Even I showed him the Interview Call Letter. Still he didn’t let me go out. I had to waste 30 minutes of my time in getting an out pass.Lack of Sports facilities : There was just one sports period in 1st year alone that too on a Saturday. Most of the time, some teacher will borrow that period. If you are a day scholar and interested in some sport, then you have to stay back and then practice it. For day scholar sportsmen coming far away it’s very difficult for them. By the time they reach home, they would have no time to study.Prolonged working hours : Day scholars are forced to stay till 5:30 pm in the name of ward counselling although the working hours get over by 4:30 pm . Most of the days, teachers conduct test during this time. They simply ask us to sign some form in the name of ward counselling attendance. This happens on Tuesday and Thursday. As a result, it takes upto 6:30 pm for the day scholars to reach home.Selling Student database : The college sells the student data to project centres and Coaching Centres. I was getting repeated Phone calls, SMSes and E-Mails from a Project Centre. That Project Centre has recruited 3 students from our college last year.Poor Wifi : The wifi speed is so slow that by the time it takes even a google homepage to load, you would have graduated.If you are a 12th Standard Student and if you are reading this, please don’t take admission in this college. Please do NOT use the counselling code 2727 during TNEA Counselling. My request to all those reading this: “Please share this answer so that no one opts for this college during admission.”UPDATE:-Replying to someone who asked “Why do you bother to apply there when you know it is bad?”. When I was about to join, I never knew about these things. I made a mistake before I took admission by not asking many people how the Institute is.UPDATE-2:-Replying to someone who says, “comparing a private college with an iit is crime, how can u do that? expecting a environment like iit in a pvt engg college is a foolish thing…”First, I definitely wouldn’t have compared had they not mentioned in my college Brochure that they have the best Graphical System Design Lab and CADD Lab in Asia-Pacific Region. Secondly, get your facts straight. Have you heard of BITS, Pilani and IIIT, Hyderabad? They are at par and even better than many new IITs.