Hello Vinay

There is no problem in your boards marks because your need minimum 65% marks in 12 to get admission.

For getting admission in NIT Hamirpur you should secure rank under 9-10 thousand ( better than this for other core branch accordingly).

You can see previous year cut offs here :

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff-for-nit-hamirpur/amp

And have a look of it and compare it with your rank .

So good luck.