Hey ,

Candidates qualifying JEE Main will need to appear for JoSAA 2019. Candidates have to register and fill their choices of colleges. 

The process will start tentatively from 3rd week of June online. Before seat allotment , mock seat allotment process is done by authorities in 2 rounds. After that the seven rounds are done to shortlist and provide college to candidates according to their merit rank and scores in the respective examinations- JEE Mains. 

For more detailed information about the counselling visit the link below : 

https://www.google.com/amp/s/engineering.careers360.com/articles/josaa/amp

It has everything you need to know about the counselling. Hope this information helps.

All the best.