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Hi Mayank,
Before you decide what to do it is important that you become aware of a critical factor for success in your chosen profession. Your exam scores are one part of it considering how competitive it is to land a seat in the hallowed campuses of the IITs and other prestigious institutions.
There are numerous branches of space science - astronomy, astrophysics, cosmology, stellar science, planetary science, etc. Originally, all these disciplines were considered as part of astronomy but with recent developments and discoveries they have become vast enough to be considered as separate fields on their own. Experts in fields such as:
1. Robotics.
2. Satellite technology.
3. Medicine.
4. Biology.
5. Remote sensing.
6. Meteorology, etc. may also seek careers in space science after developing the skill sets necessary for the job.
There are quite a few institutes in India that train students for pursuing careers in space science and technology. The recently established Indian Institute of Space Science and Technology (IIST) offers graduate and postgraduate programs in space science and related fields. Apart from IIST, a few other institutes like:
1. The Vikram Sarabhai Space Centre (VSSC).
2. ISRO Satellite Centre (ISAC).
3. Space Application centre (SAC).
4. National Remote Sensing Agency (NRSA).
5. Liquid Propulsion Systems Centre (LPSC) also offer research opportunities in space science and allied fields.
Some of the Indian Institutes of Technology (IITs) also offer specialization programs (M.Tech) in Space Technology, Astrophysics, Aerospace engineering etc. The eligibility criteria for joining programs in space science and technology vary according to the specific requirements of each job.
Admissions to the undergraduate courses at the Indian Institute of Space Science and Technology (IIST) is made on the basis of a candidate's rank in the Joint entrance Examination conducted by IITs. In other places, candidates with B.Sc, M.Sc, BE, ME or Ph.D are usually selected. Study of science subjects such as Mathematics, Physics and Chemistry at undergraduate level is usually a mandatory requirement.
However, before you join a career in space science, it is necessary for you to know the various requirements of the field - which skills to develop, which courses to take, where to study.
I hope it helps.
Wish you luck!