Hey,

Firstly congratulations for securing this rank. It's a huge thing.

Last years cut off rank (last merit rank) admitted in BHU for MBBS was 761 for general category. Your rank is very near but still chances are less if you are from general category. If you have a caste reservation, you will definitely get admission in Institute of medical sciences, BHU. Check the following link to know about the admissions in BHU.

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cutoff-bhu/amp

All the best