Mop up round is conducted after the NEET UG 2nd Round of Counselling is over and seats are left. In order to fill up the vacant seats, the Mop Up Round is conducted. The Mop Up Round is conducted to fill up the seats left vacant in Central and Deemed Universities. There is no fix number of seats which are fixed for mop up round, the total number of seat left after the first two rounds are made available for mop up round. Hope this may help you.