Hello, 

IISC is one of the best colleges to take up aerospace engineering in india. Apart from IISC, there are many other colleges  as below that are best for aerospace engineering

• Amity School of Engineering, Noida
• Manipal Institute of Technology, Manipal
• School of Engineering, University of Petroleum and Energy Studies..
• Indian Institute of Technology Madras
• Indian Institute of Technology Bombay
• Indian Institute of Technology Kharagpur
• Indian Institute of Technology Kanpur
• Indian Institute of Engineering Science and Technology Shibpur
• Birla Institute of Technology, Mesra etc.,

For more information regarding colleges for aerospace engineering please go to through the following link 

https://engineering.careers360.com/colleges/list-of-aerospace-engineering-colleges-in-india

Hope this helps....