Homeschooling for your sims?

I don't know if this helps or not but MCC allows kids to quit school and you can cheat grades to an A with this mod. With the Sim selected you can promote and demote careers using the right click menu. This mod treats school as a career. If you quit school though kids don't have homework.

Another partial solution is Scarlet's Mods. She has a homework mod for subjects. You can choose what your kid learns by subject. You could just stop your kids from going to school in the morning and they would still have homework. Get Scarlet's mod and use MCC to cheat the grade. I do this sometimes. At least with Scarlet's Mod the homework has purpose.

Note: There is also a cheat code for the game you can type to edit the grade if you don't want MCC. I think there is also a separate mod that allows kids to just quit school. I prefer MCC because it does a lot of things under one menu. MCC eliminates bunch of smaller separate mods. When the game updates and brakes mods it's updated quickly. Usually the same day.