I have got a year back in aeronautical engineering. Which course should I opt in this time frame?

As you have preferred the toughest branch, don't stop in the middle. Just try to get placed in an IT company to gain experience and then go for further studies.

Hello Gaurav, Aeronautical Engineering is tough branch. It may not be feasible for you to study anything else. But, yes, if your college is offering some small courses on the campus and if you like them then surely take those. Best wishes.