Hi Sanjeev! Top engineering branches in IITs serially are :-
1) Computer Science
2) Electrical Engineering
3) Mechanical Engineering
4) Civil Engineering
5) Electronics Engineering
6) Chemical Engineering
7) Engineering Physics
You can know more about each of these branches through this link :-
https://engineering.careers360.com/articles/best-iit-for-top-engineering-branches
Thank you!

Hey
Can you ask the question more clearly so that we could give the best from our end