Dear aspirant,

Tata Institute of Fundamental Research (TIFR Mumbai) offers research and integrated programs at PG and doctoral levels. There are M.Sc, M.Sc+Ph.D and PhD courses offered in various streams of Science. Admissions are entrance based for all courses.

So you can't study/research in TIFR until you complete undergraduate course.

By the way you can do SUMMER INTERNSHIPS with the Institute which were released time to time while studying B.Sc. which will definitely help you in your career.

You can visit the link below for the best institutions for B.Sc. course,

https://university.careers360.com/colleges/list-of-bsc-degree-colleges-in-india

Hope it helps you...

Best of luck..