Hello Aspirant

No, you won't have to attend the college for physical verification again, because if you were allotted a college during previous round and you have already reported to the college for the document verification to confirm your admission there is no need to visit that college again.

The only thing that you would have to do is wait for further rounds for a better seat in other college, the process of payment of seat acceptance fee and document verification generally takes place only once.

Other than that you may be asked to pay the remaining fee of the college through online/offline mode depending on the college, then you would have to pay that fee and if in further rounds you get another college your fee will be transferred by the counseling authority/ your previous college to your next allotted college.

Hope this helps