Science

Obviously physics/ chemistry. Agriculture is a good subject but scope for the job is limited. Also, I know some colleges where biology in 10+2 level is a must for agriculture studies. From physics at graduation level, you can select bio-physics in Masters. Similarly, biochemistry for chemistry. Basically physics, chemistry has versatility in the field of higher studies or jobs.But agricultural studies in only one way course. I will strongly recommend P/C.

Hi,
How are you?
Well other then IITs and NITs, there are many private universities like VIT, SRM, BITS, Galgotias, NIRMA University, UPES-Dehradun, Amity, Sharda, LPU which are having high placement records and the decorum here will make your personality.
Thank you and keep asking.

Yes, definitely you can get admission in NIT at this score.

Opportunities for biochemistry graduates to work in ISRO are very restricted.

I think B.Tech would be better for you.