Central government recruitments need the OBC certificate in the prescribed central format, not the state format.
The certificate must show Non-Creamy Layer (NCL) status for the relevant financial year.
Get it issued by the competent authority — usually the Tehsildar or SDM — well before document verification.
You declare your category in the application, but the certificate itself is checked at document verification.
Keep income, address and identity proofs ready when applying for the certificate.