Hello,
If you have registered in the first round then you don't have to register again. If you visit the online site and read the broucher then you will get a paragraph saying:- "Please note that Registration facility will be available before start of 1st Round on date as notified in Counseling Schedule and Candidates who could not register at beginning of 2 nd Round. Candidates who have already registered during 1st Round need not register again. Also, Fresh Registration will be available before mop-up round of the counselling to be conducted by the DGHS."
This paragraph answers your question. For more details you can check the page:- https://mcc.nic.in/UGCounselling/Documents/FAQMCCUG2019.pdf
Hope it helps!
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