Hi, 

If you want to  acquire the state quota in neet counselling then you should have that state domicile. Only then you can get a seat there in 85% quota on the basis of you marks. In neet it does not matter from where have you passed the 12th or 10th.it is only for the jee. So you can do your 12th class from anywhere in India. You will be considered under the state quota of bihar if you have its domicile certificate. 

For any other information you can ask from us.