NSIT takes the admission through JAC Delhi counselling on the basis of JEE Main score. As per the eligibility you should have minimum 60% in class 12th. You can check the further information with the given below link.

https://engineering.careers360.com/articles/jac-delhi-counselling

NSIT is Netaji Subhash institute of technology delhi.This is india's top institute.You can get into this on the basis of jée main rank.There is an special counciling for getting top institute of Delhi like DTU,NSIT,IISET.which is held between july to August .You can go through that.You must score greater than 230 to get this in jee main.