Hmm, I see...but don't they get taken away by social workers when their grades get low enough? I've never had sim kids with grades low enough to find out! I'll have to grab that daily save mod, then, just in case I have an issue.
Oh, I mainly make heavier use of MCCC in saves where I do my seasonal play-I set special age lengths, and pregnancy, too, and age up all sims once a year on a specific day. It's my my preferred play style for most games. Playing without it won't be an issue for challenges.
I've just played that way since Sims 3, and with Seasons finally out, I can play Sims 4 that way, too.