PCM IS mandatory for guys like you who wanna pursue aeronautical engineering and the best college for it IIST,there many others but this is government based and you dont have to a penny for that ,After this you have GET to work for ISRO.MY  advice is that you try for it,otr else you can go for iits,nits,iiits etc

Dear Yash,

In order to do aeronautical engineering you have to complete your 12th class after that you can appear in the entrance exams of engineering.

You can check the top colleges in aeronautical engineering below

Manipal Institute of Technology, Manipal

PEC University of Technology, Chandigarh

Indian Institute of Space Science and Technology, Thiruvananthapuram

Madras Institute of Technology, Chennai

Sathyabama University, Chennai

Acharya Institute of Technology, Bangalore

To check the complete list you can refer below link

https://engineering.careers360.com/colleges/list-of-be-btech-in-aeronautical-engineering-colleges-in-india

Good luck!!