Not sure if you saw the book I linked to in my other comment, but that's the premise:

"This book compares how traditional schools can, metaphorically, act like a ski school, which temporarily organizes its students into classes where each student shares a specific and common instructional need but has previously mastered the critical prerequisites that will enable new learning to take place."

https://www.amazon.com/General-Systems-Unique-Learning-Schoo...