Hi,

Bank PO stands for Bank Probationary Officer. It is a managerial level post which is offered in different Public Sector Banks as well as Private Sector.

Yes, your brother can apply for the Bank PO post with the OBC a certificate.he must carry the Caste Certificate issued by the competent authority in a prescribed form given by IBPS. Also, there is an age relaxation of 3 years that is  applicable for applicants belonging to OBC category.

All the best student,

Hope this helps you.