Hello Irfan,

It's nice option but keep in mind that the eligibility criteria of NITs mention that you need minimum of 75% marks and 12th in case you are a General or OBC candidate and in case of ST SC candidate you need minimum of 55% marks. While preparing for JEE mains could be a gateway to NIT but make sure that you eligible for NIT before that.

If you are eligible then go on a prepare well and you might get up seat in NIT with computer science engineering.

I hope this helps.

All the best.