How many year valid in cast certificate

For higher study

I have the certificates that two years before

Hello,

You do not need to renew your caste certificate for any of the registration procedure. You need to have the caste certificate as well as your caste validity certificate only.  However, if you belong to OBC category then you will have to renew your Non-Creamy layer certificate after every one year as this certificate has a validity of only 1 year. 

Hope this helps.

Good Luck.