Hello!!

After your 10th,opt for a science stream in 12th with maths as compulsory subject.After doing 12th, you can either opt for Mechanical Engineering, Electrical Engineering, Aerospace Engineering,Chemical Engineering or Computer Science Engineering.Because vacancies are mostly posted in the recruitment drive of ISRO in these fields.Try to maintain your grades above 70% in both 12th and graduation.Then you have to clear their recruitment tests and can land into ISRO.

Try to clear JEE advanced. with sufficient score to get into IIST and choose B tech course offered at IIST.It will be easier to get into ISRO with a graduation from IIST.All the best!!