Hey Manideep,

Hope you are doing well!

Following are the reservations for OBC-NCL in IIT'S,NIT'S.IIIT'S,GFTI'S:

1)For IIT's the reservation is 27% and the admission is through JEE-ADVANCE.

2)NIT'S-offer seats on 50% state quota basis and 50% on other state quota basis.

3)IIIT'S-Based on state quota/other state quota/all India quota

4)GFTI'S-Based on All India quota

Hope this was helpful!

All the best dear!

Keep Smiling :)