As of the 2019 AAYUSH Round 2 counselling, the last ranks of OBC to get a BAMS Private college (AQP) had the marks between 101-111. So, any marks above that may fetch you BAMS seat in Private Ayurvedic College. You can apply through AYUSH counselling. However, the accurate cut off for 2020 cannot be predicted until seat matrix is released but it will be almost on the same lines as 2019.