Because why? They want to go to school? They want to do the work?
I've mentioned before the huge amount of work that goes on in schools into getting kids to do the work. Parents experienced it over lockdown. Large swathes of kids do not want to go to school. Many that do want to go to school do not want to do the work.
And not just the ones that you would call 'bad kids'.
Adults generally don't want to work either, that's why we pay them to do it.