Hello,

It doesn't matter which college you want to study B.tech, as there is no specific college that can help you to get into ISRO.The process is give below :
The eligibility criteria for ISRO recruitment is as follows:

• Candidates must have qualified B.E/B.Tech or equivalent qualifying degree in first class with an aggregate minimum of 65% marks or CGPA of 6.84 on a scale of 10.

• Students in their final year of qualifying degree are also eligible to apply, provided their final degree will be available by July 31 and secure an aggregate of 65% marks or CGPA 6.84 on a scale of 10.

ISRO recruits Scientists through ISRO Centralized Recruitment Board(ICRB), an exam conducted every year for the posts of Scientist. Individuals are tested as per their respective branches of engineering and after clearing the interview, one can get appointed as a scientist or an engineer at ISRO.

I hope this helps.