Hello Mahesh,
Considering you are interested in astrophysics, let me guide you a little bit here.
Firstly, you will need a bachelor's degree in astrophysics or physics. Currently, no proper Indian Institute offers an undergraduate course in astrophysics except IIAP, Bangalore, and IIST are the best colleges providing the bachelor degree in astrophysics. Even so, I suggest you apply to Universities abroad.
Some of the top universities you can look to get into are :
Otherwise, you can take up Physics major and go for a masters degree in astrophysics for post-graduation.
Hope this helps.
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