Hello Krishna
It is really good to hear that you are interested in joining ISRO. There are some eligibility criteria to join ISRO after your Btech.
You are required to appear in an Entrance Examination which is conducted by ISRO itself. You need to full fill the following Criteria In order to join ISRO: The candidate must have completed their B.E/B.Tech with at least 65% from a recognized university. Age should be between 21 to 35 years.
For more info check out our link : https://engineering.careers360.com/articles/isro-drdo-barc-dae-how-work-here
Candidates can check B.Tech Cut off for Top IITs & NITs here.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile