In order to become a scientist you should have analytical and critical thinking skills.

You'll need to be well specialised in mathematics. Scientists in the physical sciences use a great deal of mathematics, particularly algebra, calculus and analytical geometry, while those in the biological sciences use math less often. All scientists need a working knowledge of statistics, too.

You need Skill in one or two foreign languages. The most helpful languages to learn include French, German and Russian.

If you want to become a scientist at NASA, then you must choose science, technology, engineering and Mathematics centered education. You can do B.sc or B.tech in your graduation. 

Below are the top colleges you can check

• Indian Institute of Technology (IIT), Delhi
• National Institute of Technology (NIT’s)
• Indian Institute of Space Science and Technology (IIST)
• Indian Institute of Science (IISc)
• Indian Institutes of Science Education and Research (IISER)

All the Best!!