Science

For Mathematics you should definitely go for ML Agarwal. His book covers all the concepts in detail in a understanding format. Visit : http://www.apcbooks.co.in/.

You can visit APC Book store for same, you will easily get CBSE Books for all subjects and for all standard here. They offer wide range of books in every domain. I would recommend you take help books from APC Books.

It is quit difficult but you must check seat allotement of last few year and analysis.

Hello,
Astrophysics is really a specialized branch of physics and the knowledge of certain areas of physics is a must. Done your graduation in engineering in a civil branch which is not actually related to physics or definitely astrophysics. How to work to help you I am attaching a link that will give you all the required information about different eligibility conditions for the different courses that are conducted by the Indian Institute of Science in Bangalore. https://www.shiksha.com/university/indian-institute-of-science-Bangalore-22350/admission
Best wishes to you.

Hello,
I am afraid you have perhaps not raise your query fully. You are saying that can a normal B.Sc. Graduate apply for this. But you have not mentioned what is the meaning of the word. In view of this I would like to advise you to raise a fresh query giving what graduation you are doing and then asking the query in simple terms as do you want to do this can you do this with your qualification. This will enable the counselors to give you a detailed and fruitful response. Best wishes to you.