Hi Aspirant,

Both DTU and NSIT are good colleges.Admission to these colleges is based on JEE rank and a decent rank is required for admission.According to past year's statistics like 2019,2018 rank for CSE branch in last round of intake in 2019 was 2866 and in 2020 it was 2734 .However  you can still get civil,mechanical in DTU with rank above 5000 in second to last rounds.Now coming to NSUT you can get cs in rank like 1849 and within 2000 as per last few years.However in civil,mechanical you can get in with rank within 9000 and IT within 3k of rank.

However you can get into IIT for engineering only by cracking IIT Advanced.

Hope it helps!!