Dear aspirant,

First of all I am explaining you the rule of choice  filling procedure briefly. During the choice filling, you can put any no of choices there and sort them according to your facvourable interest . In every round you will be allotted only one department of one college . According to your sorted choice list the top most available choice with vacant seats will be given to you . If you are happy with that then you lock that and get admission . Otherwise you upgrade( slide or float) If any of the preceding choice's  seat  becomes vacant then you will get than otherwise you get the allotted seat given to you from the previous round. But under any circumstances you can't get the receding choices after you are allotted a particular option.That's how it works. So choice filling and seat allotment is very vital.

So if you don't get anything new ollege or department in round 2 then you will get the seat of round 1.

Same rule applies for round 2 and 3.

Mop up round is basically the last round of counselling process after the ending all round of counselling is over it happens with the left over seats . Students take part in this for the remaining seats from the main parts of counselling. Unique and positive thing about this round of counselling is that a particular student can re-sort re-arrange and re-build their choice filling list in this round. It is the last centralised counselling processs before the decentralized counselling process by individual institutes.

Hope the following website must be quite helpful for you:

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

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

Best Wishes for your upcoming future.