I am your brother, and I also worked in KFC during my college years. If you want to work in KFC, you should be prepared for a long time.

I'll teach you a way. You can find a KFC near where you live. If they recruit people, they will post a job advertisement at the door of the store. You can just apply directly. It seems that I need an account page or something. I don't know if I need it now.

as for the health certificate, KFC will handle it for you after you are admitted.