If you want to open Caste Certificate Centre, you must buy a franchise of GST Suvidha Kendra from the GSTN Authorised agency like:

 

Once you purchase the license from there, you will be able to serve the community with multiple Jan Seva Kendra services like Caste Certificate, Adhar Card Update, Pan card update, and much more. You can get a list of all services from this informative and official site: