Hey Gaurav,

There are only a few colleges which offers you admission for BTech without the clearing the JEE Mains. JEE Mains offers admissions into the goverment engineering institutions such as NITs. You have a variety of private colleges to take admission into. Check out the following link for the same:-

https://www.quora.com/Can-I-do-B-Tech-without-giving-the-JEE-like-CIC-Delhis-B-Tech-is-IT

Hope this helps!