Hey sonika!

If you have all the required documents which make you eligible for NRI quota but  you have not applied under NRI quota in first and second phase of counselling , no worries , you can now apply under NRI quota as fresh registeations are made for the mop up round . And also , last year 80% of the NRI seats were left vacant for mop up round , so you will have definitely better chances of getting a seat under NRI quota 

To know more , follow the given ljnk:

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

Hope it helps!