Dear Aspirant

Yes you are the about the selection of iit on the basis jee advanced rank

First you have give jee mains then you have to cleared  its cutoffs when you passed it then you have to give jee advanced .then then according to your rank base you get college.

Previous year  jee advanced cutoff

JEE Advanced Cut Off 2020

You can visit official website

http://jeeadv.ac.in/

If you want to know more about it check out the link given in below

https://www.google.com/amp/s/engineering.careers360.com/exams/jee-advanced/amp

Thank you