Hello aspirant!
I hope you are talking about the stray rounds of neet that is been conducted after the mop up round.

You can get your information here:

Stray round is held after the mop- up round. If the seats remain vacant, then stray round take place to fill the vacant seats.

1.Who are Eligible for Stray Vacancy Round of Deemed/ Central Universities?

Ans. All Registered Candidates except the following three categories are eligible for Stray Vacancy Round of Deemed/ Central Universities:-

a) Candidates who joined the allotted seat in Round II of AIQ/ Deemed/ Central Universities.

b) Candidates allotted a seat in Mop Up Round of DGHS

c) Candidates joined a seat in Mop Up Round of DGHS.

2. Who are not eligible for Stray Vacancy Round of Deemed Universities? Ans. Following Candidates are not eligible:-

a) Candidates who joined the allotted seat in Round II of AIQ/ Deemed/ Central Universities.

b) Candidates allotted a seat in Mop Up Round of DGHS.

c) Candidates joined the allotted seat in Mop Up Round of DGHS.

d) Candidates who have not registered in any of Previous 3 Rounds.

3. Will there be any Fresh Registration for Stray Vacancy Round?

Ans. No, there will be no Fresh Registration. The 10 times vacant seats list of registered candidates will be provided by DGHS to colleges for Stray Vacancy Round as per the direction of Honble Supreme Court directions and as per regulations of MCI.

If you want to know more the counselling process then go through the article given below:

https://medicine.careers360.com/articles/neet-counselling

Hope this will be helpful for you!
Regards!