The cut off varies college, branch, category and quota wise but as per previous year information for NIT-Delhi computer science branch the closing rank for round 1 was 6362 (HS) so as per this much rank 210+ marks would be the safest score to get seat there.

Also, for IIIT-D and DTU you will have to appear in JAC Delhi counseling and for IIIT-D the closing rank was 10588 so according to that 190 + and for DTU it was 5628 so marks range should be 220 approx.

So if we talk about overall marks range then better to get 190 - 230 so plan and prepare accordingly.

Good Luck!!!