Best colleges for Aeronautical engineering are:

• IIT Bombay
• IIT Kanpur
• IIT Kharagpur
• IIT Madras
• Madras Institute of technology, Chennai (Notable Alumini : Dr. A P J Abdul Kalam).

These are the few best colleges which I know.

Through the above institutes you must have understood that you should get seat in IIT.

If not you can also join other universities which provide Aeronautical engineering. But make sure that, the college which you are joining have campus placements in to Aeronautical companies. Otherwise you have to struggle a lot after your B-tech.

Because it's of no use doing Aeronautical engineering in B-tech and joining some software company later. Opt Aeronautical engineering only if you are really passionate about it.

Aeronautical Engineering is the specialized branch in aviation industry. The area involves studying, designing, construction and science of the airplanes and other spacecraft. Aeronautical Engineers must have an eye for detail. They should be excellent in mathematics.

Top aeronautical engineering colleges are in the link below, please have a look :

https://www.shiksha.com/b-tech/ranking/top-aeronautical-engineering-colleges-in-india/49-2-0-0-0

Good luck !