Hey Mahavir.

See the marks u have scored belong to the average marks in JEE MAINS. U might not get the good NITs for ur btech career but u can get the lower ones like NIT SILCHAR etc for ur further study.

I m providing u a link for ur help. 

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/jee-main-college-predictor&ved=2ahUKEwjZkMOY7s_hAhXm6XMBHbdcDiQQFjABegQIBRAB&usg=AOvVaw1pTMu5LewXe0n3JPiA8V2U

Ask if any query.

Good luck

We can't predict right now dear, let wait for percentile then we are available to calculate the rank then as previous year cutoff we can easily get our answer which NIT you gets. Percentile depends on many factors that's why we can't predict it. About your marks its quite good.

All the best dear