It's funny, I am doing my CPL subjects at the moment. I have a PPL licence that I have had since 97. I was hoping I could just do the CPL law exam and get current with my PPL rating but oh no I have to do the PPL law and the CPL law as I am finishing my CPL. This seems a bit silly but oh well loving flying again after so long away from it. I know why you need to resit law after five years away from it. I forgot most of the law side of things. As for flying well just like riding a bike not a problem. Good luck!
Naki Boy