If you want to avail Reservation benefits under Disabled Quota, you should present yourself before a before Medical Board in the State of Bihar. The disability certificate should be produced by an authorised Medical Board of the Govt. Of Bihar. So a PWD certificate issued by authorised Medical Board of the Govt. Of Bihar is enough for State Counselling. But for All India Counselling, you will need the certificate from any of the MCI approved Disability centres.