Hi, 

With your reservation and score you have quite high chances of getting a government college under the 85% state quota counselling.

According to last year the following colleges closed around your score for OBC category:

-Anugraha narayan magadh medical college, gaya-531
-GMC, bettiah-519
-Vardhaman institute of medical sciences, nalanda-534
-Darbhanga medical college-532

So indeed have a fair chance. 

However its not possible to give u a 100% guarentee since this analysis is on the basos of last years cutoff. The cutoff trend tends to vary every year. 

I shall attach a link below for further assistance:

https://medicine.careers360.com/articles/neet-cutoff-bihar/amp

All the best