Hello!

So,If you have Caste certificate issued in 2017 and you are from SC/ST category than may be authority will accept your certificate but if you are  from OBC or EWS category than the certificate must be issued within one year before the admission process. This means that a certificate from 2017 will not be considered valid in 2025 and you will need to obtain a new one.

Therefore it is always safer to get your certificate updated close to the time of admission to avoid any issues during document verification.