Hi Bhushan

This is Ritika 

You have got very good percentile .you belong to sc so you can definitely got Nit .

But it is difficult to predict that you will get top nit or not .As jee main conducted for 2 times this year  .

 Formula to calculate your expected rank (100- your total score) * 874469 / 100 if you appeared in January

If the number of candidates for April exam increased to 1400000 then your final rank shall be (100- your total score) * 1400000/100

You can use jee main predictor for admission possiblilities 

Https://engineering.careers360.com/jee-main-college-predictor

All the best

Hope my answer helped you

Thank you