The exact prediction would be tough for your admission chances with your score as BHU is taking the admision first time for BAMS programme through NEET. So I would suggest you wait till it officially announced.
Approximately range of 550-640 has been trend over past few years.
With above scores your chances very less.
You cn us eour college predictor tool for more information.
NEET Online Preparation
Crack NEET 2020 with NEET Knockout Program, If you Do Not Qualify- Get 100% MONEY BACK