Hello

Yes, the OBC certificate is valid for the Punjab state government jobs

OBC certificate is valid for any state in India so just go and give the exam

OBC  Other Backward Classes-Non Creamy Layer. It is a certificate issued by the central govt to people who are under the central obc list and whose income is under 6 lakhs p.a. for the reservation to educational institutions and jobs .

SO if you have that certificate then use it.