I have Issued Sc certificate from my state gov in 2023, Do Sc certificate has to be updated every year or they are vaild lifetime

SC certificates issued by the state government are generally valid for a lifetime unless there is a change in caste status or government rules. You don’t need to renew it every year.
However, for some exams or verifications, you may be asked for a recently issued or verified copy, so keep an updated attested copy if required.