Science

Hello,
You can check the below mentioned institutes:
1. Technology Information Forecasting and Assessment Council (TIFAC).
2. National Human Rights Commission (NHRC).
3. Indian Academy of Sciences Summer Research Fellowship.
If you are willing to pursue your career further as a junior research fellow or an assistant professor, then you can also prepare for CSIR NET exam, which is conducted for the science students twice in a year.
You can check the below mentioned link for the cutoff of CSIR NET:
https://scoop.eduncle.com/csir-net-result-cut-off-marks
Best of luck.

Hello,
There are too many career options available after completing your 12th studies.
But firstly you have to decide what you actually want to do & become in your life and then decide your graduation course accordingly.
MBBS
B.Sc.
B.Tech/BE
BCA
Best of luck.

This section is to entertain queries for MBA at BITS, Pilani. You should post in your respected section. But, in my opinion, you have to clear BITSAT exam to get admission for M.Sc.

Yes, these books are good to prepare for IIT JEE and before studying this books you should be thorough with your NCERT which will help you in building your basic concepts.

Yes, you can pursue M.Sc in astrophysics but only in theoretical astronomy. For others, engineering is required to pursue higher studies in this. You can refer to below article for this.
http://indiaeducationdiary.in/career-options/Science-Astrophysics-Eligibility.asp

What kind of course you are looking for?