In order to take admission in IITs/NITs/IIITs and GFTIs you should have 75% marks in your board exam or you should be in top 20 percentile.

For SC/ST you should have 65% marks.

To take admission in DTU or NSIT you should have 60% aggregate marks in P/C/M. There is relaxation of marks for reserved category. 

Try to score more then 190 marks in JEE Main to get admission in DTU or NSIT in general category outside Delhi region. Cut off marks also varies according to the branches.

There are many private colleges as well who consider JEE Main score to provide admissions. You need to apply seperately for them.

You can chck the list of colleges below

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

You should appear in your state level exam to take admission in state level government colleges.

All the Best!!