Hello mohit,

There are different posts in ISRO, it totally depends on which post you want to apply for.

For space scientist post you need to study one do the courses

1) Btech in aerospace engineering/Avionics engineering.

2) MSC in Solid state physics, astronomy,Earth system science.

3)Mtech in electrical, electronics, mechanical and computer science.

4)PhD in relevant disciplines.

PhD in maths is an advantage.

I hope it helps.