Hi Yogesh, if you want to take admission in JIIT then you need to qualify for jee-exam, they take admission on basis of jee rank.if you want to take admission based on 12th merit then or non-jee then you will get admission on JUIT, JUET, JU-A.

if you want to know about more then check it out the official website :

http://www.jiit.ac.in/admission-procedures

good luck