Once the registrations are closed then unfortunately we cannot do anything about that as it all in the hand of te authority. After the registration only you will be able to get the counselling rounds and the seat allottment. So if you have missed it out then you may have to wait for the next year to apply again for the medical or dental courses. You should also keep checking the website for such dates and processes as they do not announce officially everything and the deadlnes would be available on the websites only.