G is right as long as someone at some point ticks the level 6 box on a test sheet thats you got it for life.
If they don't you have to go for a test at a center and they will grade you. Anything less than 6 and you will have to do the test again after a period of time.
If you already have the PPL and haven't had to do the test to get your radio license I suspect you already have a 6.