There are chances of your selection in nits. But if you fall for c.s. there are no chances in getting top nits. Keeping branch aside you need only to be selected in top nits there are chances of your selection. In this confused state i think this might help you out: 

https://engineering.careers360.com/jee-main-college-predictor?icn=jee-main-clgpd_landing-page&ici=top-section_engineering_domain-home

Predict your college and branch and make the right decision. All the best.