In order to get admission in NITs/IIITs and GFTIs you should have 75% marks in your boards exam or you should be in top 20 percentile. For SC/ST you should have 65% marks.

If you want to take admission in DTU and NSIT you should have 60% aggreagte marks in P/C/M. There is reservation for reserved category. Counselling will be held through JAC Delhi.

There are many private colleges as well who consider JEE Main marks to provide admission. They have different eligibility criteria. You have to apply seperately for them.

You can check the list below

https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India-accepting-jee-main-score

Good Luck!!