Graded classes are part and parcel of institutionalization.
Another question that comes up is in regard to children leading their learning and not having to do busywork. After all, in adult life, we all have things that we don't want to do that we must do and the discipline for that must be learned. To that I say that chores and other structure within a household and within our lives teach that discipline. Somehow we've gotten it into our head that learning is a thing to be endured, and we must do it, unpleasant or not.