J.W.
I have never seen a book that covers multiple personalities. Heck I have yet to see a book that covers anything useful.
In my opinion kids are simple, it must be worse to not do whatever. In the good old days you forget your homework you get a big fat F. No one does that anymore, they get another chance, and another chance......
So you either do what I did, tell their teachers if it isn't there it is an F or you come up with something else. I would suggest life ends until the next day of school. So you find out they didn't turn in their math on Wednesday, Wednesday night, no TV, no phone, no computer, no nothing..... For the sake of your sanity I would suggest a buy out, say they get it done ASAP or without prompts, say they have it done before you realize it, well then they don't lose the whole night.
What you want in the end is them looking at their backpacks without asking. The only way you can do that is if what happens if they forget is worse than remembering the first place. Clear as mud?