Dear Saurabh,

According, to the eligibility criteria in order to take admission in NITs you should have 75% marks in your board exam or you should be in top 20 percentile for general category and 65% for SC/ST. 

If you get 60% aggregate marks in PCM you can apply for DTU and NSIT for general category. There is a relaxation of marks for reserved category. You should have english as your subject. 

DTU and NSIT takes admission through JEE Main only and counselling will be held through JAC Delhi. 

There are many private colleges as well who consider JEE Main marks to provide admission only you have to apply the application form seperately. 

Good Luck!!