It OT, it's just called curriculum
Lumudei chol ain't a thing.
100%
At OT anything that smells like limudei chol is chazzer tried, their mission is חינוך על טהרת הקודש
ETA: to clarify, OP asked about CH in general and title is about Lubavitchers in general. It should be clarified that other Chabad achools in and out of CH have various standards for Limudei Chol, some of which are pretty high. Interesting it’s coming up now because I just found out a relative of mine teaches limudei chol at a CH school.