Hi !

As far as the official counselling schedule is concerned , there is only one step of document verification. They will conduct document verification only once. But , sometimes the schedule may change depending on situations , so you should get in touch with the official website's updates.

Hope it helps !

Check out the following websites for more information:

https://medicine.careers360.com/articles/karnataka-mbbs-counselling

https://cetonline.karnataka.gov.in/kea/