There may be a chance that you can get NIT although probaility is not so high .on the other hand you can calculate your rank through your percentile which may help you knowing your rank.

Rank= total no of students appeared -{percentile*0.001*number of total students} use this formula in order to get your rank.

And i will provide a link through career 360 which may help you compare your rank with previous ranks , so that you will get an idea of whether you are eligible for nit or not,  also you can check your eligibility for other government colleges through mains exam on career 360.

Https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-top-nits/amp

Link for compairing your rank for nits

Https://www.careers360.com/college-predictor

Link for college predictor

Hope it helps .

All the best