As an educator, I've often wondered about students, teachers, and school systems gaming the system.

Somehow I devised a "Unit Based Curriculum" where students move through modules at their own pace.

https://medium.com/@davevolek/unit-based-curriculum-81d610bfc857

It's biggest drawback is that it's more difficult to motivate students. I have a son with a bit of autism. He doesn't like schoolwork, but can be motivated when he sees his peers doing it.