Hello Jagdeesh,

Following are some best branches which are suitable for getting a job in ISRO are:

1. Mtech in communication

2. M.tech RF and Microwave Engineering

3. M.tech in DSP

4. M.tech in VLSI

5. M.tech in solid state tech

6. M.tech in geo informatics

7. M.tech in Control Systems

These are only little bit. More options are also available there.

Good luck