You need to take up Aeronautical engineering or Aerspace engineering from top Colleges like IIT Kharagpur, IIT Bomvay, IIST Thiruvanthapuram, IIsT Pune. 

Good knowledge of aircraft and missile laubching is mandatory for job opportunities at NASA and ISRO. 

Studnets can also tak eup Mtech/ MS Course in Aerospace /Aeronautical engineering from top colleges.