Hello Akanksha226017

I hope you are doing good. As per your query , I would glad to inform you that tier-1 colleges like NITS and IITS dont offer bca course from very starting . However NITS do offer Masters in computer applicatiobs which you can persue after bca . For bca you can give entrances of college like guru gobind singh indraprastha university , Christ university , IGNOU(for distant learning), Amity university noida

Hope you found this answer helpful. Good luck for your future