Hello Raju,

You will get the certificate from the office at Block of your area. But here I am sharing the prescribed OBC Certificate format which will be used everywhere in order to claim, to which you belong.

https://www.rtpsbihar.com/obc-certificate-bihar-apply-online/

The validity period for the certificate is 3 Years if you made it up to DM (District Magistrate) level. Otherwise, it will have less validity period. In my opinion, it is better to have your OBC caste certificate from DM.

Good luck!