Hi Twinkle 

The counselling for AIQ will be conducted by MCC. As per the information in their prospectus after the completion of First round of counselling the vacant seats are transfered for 2nd round of counselling.In the 2nd round of counselling if some seats remain vacant they are tranfered to the state quota seats in case of govt colleges. For the deemed universities if vacant seats remain after 2nd round of counselling they are transfered for an additional Mop-up round of counselling. The remaining seats after Mop-up round are transfered to state quota.

you can go the link below for more details.

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