I quite don't get what you are saying. You have mains score 185, but rank is 28588. Jee advanced score is 30 and rank is 3447. Now if i see your rank then you are eligible for good college with this rank in iit. And i guess that you must have filled right informattion, right order of college, so that you gets in the right college. If you are getting iit, then why to go for nit. 

Hopr you understand.