Hope you want doing good in this pandemic situation. Let me get straight to the point that yes you have very high chances of getting a medical college. You also have AMU internal Kota so that's an added advantage along with that you can apply through the Bihar state counselling also.

You can check out the cut off for AMU in the last few years here.

https://university.careers360.com/articles/amu-cutoff

Also here is the cut off for medical colleges in Bihar

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

You should definitely use our college predictor tool to know about your best chances