Dear Karthi, you can study Aerospace Engineering with your Bachelor's in Electronic and Communications Engineering at IIT Bombay. With his Bachelor's you can get into Dynamics and Control Specialisation of Aerospace Engineering. For this you need to have valid GATE score. The basic eligibility criteria is that you should have a minimum aggregate of 60%. For more information, please visit their page at : https://www.aero.iitb.ac.in/home/postgraduate-program