I would like to inform you that you have to crack written exam and interviews to get admission into IIT Delhi even if you are having good gate rank. If I talk about general category then your rank should be under 150 to get a call from IIT Delhi for M.Tech in CS and for OBC, should be under 200. It’s difficult to say about SC students score due to dependency on seat availability or applicants gate rank but would be better if your gate rank is under 2000.
I would suggest, try to obtain rank under 400 -500 to get admission into Good IITs with good stream.
GoodLuck .