Hi aspirant ,

OTH and OPN refer to the category of the applicant. The cut offs are different for each category.

1. unreserved-50 percentile- OPN quota

2. OBC-other backward class- 40 percentile

3. SC- scheduled caste

4. OTH- others

5. PH- physically handicapped

For information regarding the cut offs for various categories you can check the link provided here. https://medicine.careers360.com/articles/neet-counselling

HOPE THIS HELPS!!