My brother appeared for the interview last year, so I think I can answer your question.

The panelists will evaluate your ability to explain new questions. They might even ask you to solve the questions on the board. You must be clear about your choice of ISI Kolkata as you will be asked the reason for the same during the interview.

Expect questions on topics such as Calculus, Geometry, Combinatorics, and Probability. Keep your basics clear, know the definitions, and practice solving problems based on the definitions.

Just keep practicing, be confident and give your best shot at the interview.

Well, I would if you are worried about job prospects and all stuff although being in ISI Kolkata then shed off your worry. Trust me; you will get a job with an average CTC matching with top B-Schools in India. Job roles such as Business Analyst/Data Scientist and many others will be offered to you.

Now let me help you more in understanding this. Let’s break this into two parts – Job vs. Higher Studies.

• Pursuing Ph.D./Higher Studies is a tough deal if you're applying abroad.
• My personal perspective, in this case, will be, go for a Ph.D. in Industrial Engineering domain. 
• That's the best option, as it will be aligned with QROR.
• Now, you should definitely rethink before applying for the courses like Data Science/ Machine Learning domain, or Statistics.
• For this, I would suggest you consider doing some projects. And if you are at the Indian Statistical Institute you will get a plethora of opportunities.

So first and foremost, just be crystal clear with your future endeavors before joining any course. Once you decide, opt for the best but don’t rush. Just give your best thought and calculate all the pros and cons.

Some of my friends took admission to ISI Kolkata for their bachelor's courses. Here are a few of their tips which you can follow while you prepare yourself at home.

• Lay emphasis on Mathematics concepts like Number Theory, Combinatorics, etc. from a standard book, like Excursion.
• Try to Solve a set of problems daily from the Test of maths at 10+2 level.
• Solve a lot of MCQs from JEE books which are easily available both offline and online.
• Learn calculus at an advanced level from the book - I.A. Maron, etc.
• Revise and fine-tune whatever you have learned till now. Take routine tests to keep a check on your preparation.

Overall, home preparation is quite simple if you want to score well enough for ISI Kolkata. Follow the important points and practice each and everything as much as you can. Also, you can always take help from your seniors who have gone through similar exams.

One of my friends is an alumnus of ISI Kolkata and here is his insight into the placements for MTech CS. 

1. The job profiles offered by ISI are mostly from Data Analytics. You will not get many CS core jobs from the placement drive. Don’t expect companies such as Google, Amazon, Microsoft, etc. 
2. As an M.Tech(CS) student, you will have a fair knowledge about IR, Pattern Recognition, Data Mining and you can easily get jobs at these visiting companies. 
3. In the recent placement drive, the highest package offered was INR 25 to 28 LPA while the average was INR 10 to 12 LPA.
4. ISI offers good job opportunities, but it is limited to a particular domain. Along with Data Analytics companies, few R&D centers like TCS Innovation, Infosys R&D, visit the placement drive. 

Other than that you can apply for summer internships and if you perform well you will receive PPOs. But if you are expecting a job strictly related to your field after the compilation of your masters then don’t choose ISI. It is an excellent option if you want to do a Ph.D. or want a career in research. 

You can apply to get into ISI Kolkata in two ways each year. Usually, right after the GATE exam, they post an advertisement in the paper for admissions. 

After this, you can do the following:

• First, take the written test provided by the college for admission and if you crack it, you will qualify for the interview process.
• Secondly, if you have given GATE, you will be called directly for the interview if you have scored well.

But, make sure that you do well in the interview. This is the final qualifier for obtaining admission.

There are three sections in the entrance exam and the level of maths is the same as what you studied in your 12th. The exam follows the pattern of most high school mathematics competitions (RMO, INMO, etc).

The three sections of the Entrance Exam consist of MCQ, A Subjective Test, and an Interview.

The books you must know are:

1. Problem Solving Strategies by Engel Arthur
2. Test of Mathematics at the 10 + 2 level, Indian Statistical Institute, Published by Affiliated East-West Press Pvt. Ltd.
3. Challenge and Thrill of Pre-College Mathematics by B. J. Venkatachala

You should complete these all and do previous year’s papers of ISI/CMI RMO, INMO and IMO.

For Interview:

• Once you crack the exam, the interview part won’t be that difficult.
• Answer the questions confidently and honestly.
• The entrance exam of ISI is not easy and also there are only a few seats for B.Stat. 
• You have to prepare well.

Do not overthink and do your preparation well. This will help you a lot. Be calm and try to think of cracking the exam and the latter part would be an easy task for you.

No, unfortunately, ISI Kolkata does not provide undergraduate courses on computer science. However, the proposal for starting B.Tech in computer science has been put forward but has not landed to any conclusion yet, and is being said that in the coming future this proposal may be accepted. 

For now, the present scenario of the undergraduate course in ISI Kolkata would just be B.Stat and B.Math. They both contain extensive teaching in computer programming as well as statistics. 

B.Math is a combination of computer science and pure mathematics and statistics. Whereas B.Stat contains lesser topics of computer science in their syllabus than B.Math.