Hi,

The category certificate is valid until the authority who have issued the certificate cancel it. It depends on the guidelines issued by the Government of the respected state. However the caste certificate issued for a specific purpose should be used only for that one. For example if you take a caste certificate for educational purpose you can use it only for that. If you want to apply for a job then you can't use it. In that case you need to take another one stating the purpose.