Get your children to get their homework done after school at school. This way you don't have to worry about taking care of getting them to do their homework.
A few weeks ago my sister told me how annoying she thought it was that she would go to work with one of her sims and then when she came home she would see that none of the kids have completed their homework and overall it's just a mess.
With this mod you can simply just either use your phone (as a teen or child) or as a parent go on your computer and sign your child up for the tutoring after-school activity. The activity lasts 2 hours and you basically do your homework there.
There are 3 available times I've included. From 2-4 PM - 3-5 PM and 4-6 PM. You should only choose one package file that suits your needs. Keep the TS4script file in. I recommend 3-5 PM as this is the standard time for schools but you can choose whichever one you want.