Hello Brajesh,
There are so many applicants who want to pursue post graduation and other degree from MIT and other IVY league colleges. Being one of the top 5 colleges of the world, there is a huge competition as applicants from all over the world apply here. You can assume that the competition is even greater than that in JEE.
For getting selected in MIT/Cambridge you will have to go thriugh some processes. First of all you will need to prepare the documents required for studying abroad. These include your VISA, Passport, your application letter, LOR, Statement of Purpose and other proceedings, that are necessary for any particular university. You may see the admission procedure for MIT from below link: https://mitadmissions.org/apply/firstyear/international/
https://mitadmissions.org/apply/ , The process is slightly different for international students. You may want to consider some professionals who conduct the admission procedure. After that you should apply and if your application is selected, then MIT will call you for interview, and after that they'll confirm your admission.
Since the number of applicants is quite high, they filter candidates based on several criteria, such as overall personality, contribution to the society, grades, extra-curricular and everything you can imagine from your writing to your financial status.
Hope this Helps
Regards
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