Dear Aspirant

You don't need to register or make payments again for round-2 if you have already done the same for round-1 but you need to make fresh choices again for round-2 as the c hoices submitted in round-1 will be treated as null and void and mind that you have to use the same login credentials as used in round-1 .

Before going for further steps, kindly read the instruction carefully given in links below
Https://medicalcounseling.nic.in/UGCounselling/Documents/SchemeUG2019.pdf

Https://medicalcounseling.nic.in/UGCounselling/Documents/FAQMCCUG2019.pdf

Hope this helps you.