How would I know which college did I get after getting my JEE mains rank ?

Hello Aspirant! After giving your JEE Main Examination and getting your percentile marks and rank you can participate in the JEE Counselling on the official website of JOSAAA which is conducted after JEE Advanced. You can chose and arrange the colleges according to your priority and if you qualify the cutoff marks of that college you will get admission in that college and branch itself. Then you need to pay the fees to book your seat and your admission will be confirmed.
You can also use this link to predict your college:
https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hello Shivam

You will come to know about the college you have been allotted at the time of JoSAA counselling.

To participate in the counselling process, however you need to first qualify in the exam. Then you have to get registered for counselling online.

Learn the full details of the counselling and seat allotment process here: https://engineering.careers360.com/articles/jee-main-counselling-seat-allotment

Regards.