If you have secured 60% aggregate marks or more in Physics, Chemistry and Mathematics at your 12th class you can apply for DTU and NSIT.

According, to Careers 360 DTU has AAAA+ rating which means outstanding and NSIT has AAAA rating which means very good. Ratings are based on Cut-offs of national / state level Entrance exams, Accreditation and Reward status, Publication record from Elsevier’s indexing database - Scopus, Placements and Faculty

In order to take admission in these colleges you have to appear for JEE Main exam and counseling will be held separately through JAC Delhi.

To check the cut off of the colleges you can refer below link
JAC Delhi Cut Off

To take admission in government colleges you can also appear for your state level exam.

Good Luck!!