Hey M Harshaarhan,

For getting into NITs, IIITs, GFTIs and IITs. You need to qualify JEE Mains with a good score to get NITs, IIITs and GFTIs. The better you score the more prestigious college you get in. And For IITs you need to qualify JEE-Advance. Getting into IIITs is easier Then NITs. As IIITs are pretty new and cutoff are a bit low.

Best of luck