Hello there

See, to get into NIT for any branch of engineering you don't need to have only board exams marks and you've to qualify jee mains examination also via qualifying the cutoff for that NIT and for the branch. And To get admission in NITs your rank should be under 50,000 in general category other state quota.

You can refer this link to see the top NITs:

https://engineering.careers360.com/colleges/list-of-top-nit-colleges-in-india

You cam refer this link for more information about jee mains examination:

https://engineering.careers360.com/exams/jee-main

I hope it helps you!

Good luck!