Hello aspirant,

As per your percentile even considering your reservation your chances of getting into NIT is difficult,you can check previous year's cut off with help of the below mentioned link

https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits

However you can get into some other colleges and participate in state level counseling or you can focus on JEE adv.

Further I  would suggest you to use the college predictor to help you figure out

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope this will solve your issue!