WOW, what tournaments do you go to where there are different brackets for A,B,C,D wrestlers?

I have been a coach in Kansas for many years and I have never heard of this.

I know there are ratings, but that is just to seed kids in the same bracket.

I have seen many tournaments where they have an "A" bracket for the experienced wrestlers and a "B" bracket for the novice wrestlers. There are also many novice tournaments in the state that kids can compete in.