Hello,

To become a scientist at ISRO, you are required to have Maths and Physics at your +2 level. Then getting admission in IIST (Indian Institute of Space Science and Technology) can be the easiest ticket to get absorbed in ISRO as a scientist/engineer.

However, if you study engineering from any other college, you can still be recruited in ISRO via their recruitment process that they conduct every year.

Now, to answer your second question, i.e. B.Tech Courses that will be best suited for you given the fact you want to be absorbed in ISRO.

Well... Every year, ISRO opens its vacancies for graduates from a variety of branches such as:

• Computer Science Engineering
• Electronics and Communication Engineering
• Mechanical Engineering
• Civil Engineering
• Electrical Engineering
• Architecture

Eligibility Criteria:

The candidate should have graduated in any mentioned streams with first class/distinction with the percentage of at least 65%.

To know more, please refer the following link:

https://engineering.careers360.com/articles/isro-recruitment

Hope that helps.