Physics Spl

You can opt for astrophysics. Also, the course is offered in very limited colleges. Try to find out the best. IISC campus is an option where you can get opportunities to know more about astronomy.

Admission is through counselling based on the score obtained in Common Entrance Test (CUCET). Eligible candidates need to appear for Central Universities Common Entrance Test (CUCET). Please refer to the link provided below for eligibility and other details to pursue this course from Central University of Rajasthan.
https://www.shiksha.com/teaching-education/course/integrated-m-sc-b-ed-in-physics-central-univeristy-of-rajasthan-ajmer-268877

Good question Arnav, see there is no straight answer to this. Every individual has his strong and weak points you have to be distinct on your own. Since MIT is the other name of innovation that is one area you should focus on. Outstanding project is a must. Physics has wide scope for this. Write in journals, get hold of top notch professors and work with them. Broaden your perspective, see how you can apply physics and where. Apart from academic does a good amount of community work and engage in your hobbies. Applying to MIT does not mean you should keep studying 24 hours. Be an all-rounder.

Your rank would be between 20-30k.

Yes, after 12th it is not necessary to go in your subject field. Presently, it is mandatory to do that so that you can do whatever you want.