and what if I exit from round 1, will I still be eligible for mop up round?

sanikaagrawal901 Yes you can :)

NEET Eligibility Criteria For Mop-Up Round Counselling
(1) Candidates who clear the NEET-UG Cut Off 2020 can appear for NEET Mop Up Round.
(2) Candidates who have not registered for NEET UG Counselling 2020 before can participate in the Mop-Up Round.
(3) Candidates who had registered in NEET Counselling but did not get a seat can appear for Mop-Up Round Counselling.
(4) Candidates who participated in the 1st or 2nd round of NEET-UG Counselling 2020 and got a seat cannot participate in the Mop-Up Round.