Dear Prateek, 

The best colleges for B. Tech in Aerospace Engineering are

• Indian Institute of Science 
• RV College of Engineering 
• REVA University 
• Manipal Institute of Technology 
• Srinivas Institute of Technology 
• Dayanand College of Engineering 
• Siddhartha Institute of Aeronautical Engineering and Information Technology 

Hello Prateek!

Nearby Karnataka, there is undoubtedly IIT MADRAS as the best college for Aerospace. Since the competition is very tough for that, I'll mention some more colleges below which are also good.

1. IISc Bangalore

2. IIST Thiruvananthpuram

3. MIT Chennai

4.SASTRA university, Thanjavur

Hope that helps!