The path you want to get into is a very dangerous one and it can totally spoil your career without you being able to do anything for it. 

ISI, B.Stat is a very famous course and is known for the entrance paper which is considered very tough by all those appearing in it. The course is tough because the student who is above the cutoff receives a huge financial help from the government covering the major portion of the tuition fee. Apart from this after the entrance exam the candidate can be certain of a well paid job one he/she completes the course and is awarded with the degree.

It gets difficult for the selections if there’s a year gap as lower age students are preferred and in your case there's a two year gap so the chances reduce even more. It would be very risky to change your college again and could cost some harm in your career.

As the scores are low you might not end up being in the college or institute you want to. But, if you do proper research you might at least land in a better place instead of getting admission to the wrong college.

If ever you are skeptical about the eligibility criteria, always check the brochure, it usually contains the eligibility condition which the candidate needs to fulfill.

Moreover, with the latest ISI Brochure, there are no percentage/grade criteria for applying, except if you are applying through GATE score in M.Tech.

My friend is currently studying at ISI Kolkata, and according to him, there’s no specific course on Data Science currently. However, students belonging to M.Tech CS often get placed in companies for data science profiles. Thus, you must check the placement insights for M.Tech CS instead.

Here are some crucial placement stats for M.Tech CS batch in recent years. 

• The highest package offered was nearly 39 LPA
• The lowest package offered was about 13 LPA
• The Average package remained 18.8 LPA and the median package was almost 18 LPA
• Various roles offered mainly consisted of Analyst, Data Scientist, Business Analyst, Data Analyst, Quantitative Researcher, Trader, Resident Researcher, Software Engineer, etc.
• The major companies where CS students got placed included Microsoft, LinkedIn, Flipkart, Myntra, Zendrive, Yodlee, Optum, Sapient Razorfish, Fidelit, Oyo, etc. 
• Other companies that offered jobs for CS students included Alphonso TV, Goldman Sachs, JPMC, Trexquant, STAR, Reliance, Fourkites, Samsung, TeraData, Play games, ElasticRun, Blackrock, and more with annual packages ranging from 12 LPA to 35 LPA.

The placement scenario at ISI Kolkata remains absolutely impressive for almost all courses. Almost everyone gets placed, except those who are going for higher studies instead. If you are confused about the placement system at ISI Kolkata, you don’t need to worry at all. You can grab pretty attractive packages with your caliber.

There are two examinations through which you can take admission at ISI Kolkata for M.Tech CSE.

• GATE (CS) with a score greater than 720.
• Written test conducted by ISI Kolkata.

The written test conducted is of two types, i.e. Objective type questions will have mathematics paper (11th, 12th, and engineering level mathematics) and Subjective paper will have questions from Mathematics and one domain of choice.

One of my friends got admission to ISI Kolkata a few years back. Here are the reference books that she used for her preparation.

• Tomato - A book for B-stat and B-math by ISI
• Previous papers provided by ISI
• Solve the sample questions of JRF Computer science for more practice.
• Books from Ctanujit classes ( It contains a lot of mock papers)

You don’t need to solve the book completely but make sure that you know which kind of questions are asked by referring to the previous papers and then solve them accordingly.

For the technical section, the questions are very basic and test the fundamental knowledge in the chosen domain. You will see the pattern and important topics from the previous year and prepare for it.

It is important to score as high as you can in the written test as it has a higher weightage.

In interviews, you will face a panel of 12-14 professors from every domain. They often ask questions based on your background and ask to prove the theorems from the technical domain. The interviews differ for each candidate. If your written test goes well, you will see your name on the final list.

Kolkata is one of India's safest cities. This city attracts visitors from all over India and the world. That's why it's known as the "City of Joy." Bengalis are extremely friendly. 

ISI Kolkata is known to have the most sought-after institute in Statistical expertise. It has one of the best faculty members in India. Out of which, 30 professors were published in Standford University.

Moreover, you have got a seat in B.Stat which is considered one of the toughest examinations for Mathematics in Asia. You should base your judgement on the basis of a stereotype as letting go of this opportunity will be a wrong decision.

Almost 50% of the batch consists of Non-Bengalis here at ISI Kolkata. There is no need to worry as the institute also has a rigid anti-ragging policy.

It is important to collect a good amount of information as to how to apply to a US college and then ask yourself which course to consider. After this, you must look for that option that fulfills your requirements and needs. When you qualify for those exams, then you must consider which one to choose.

• For the Ivy League colleges, you will be required to appear for GRE Mains and TOEFL. 
• In almost all cases it would be a better prospect for you to give GRE as an exam as it will give a bit more of a specialized vibe to your application. 
• The next step would be to send in your application to individual universities along with your CV, mark sheets, and letter of recommendation from your college faculty.
• In some of the cases, they also require you to send a good SOP. 

Now, you must gather information about all of the above-mentioned exams and start preparing for them.