Hey

While the OBC status of a candidate may change only when the community of the concerned candidate is removed from the OBC list, his/her creamy layer status may change any time. Therefore, it is not possible to determine a fixed validity for the OBC certificate.

For most practical purposes, the validity of an OBC NCL Certificate is treated as 1 year. If your OBC NCL certificate was obtained before 1 year, it is always better to get a new OBC NCL before applying for exams.