As a general "rule" we don't do paperwork on Friday's. Many reasons for this. Number 1 - being he doesn't like paperwork to begin with. (so as long as he has done his best Mon - Thurs. , Friday's is for fun work!)
Is there such a thing as fun work? Of course there is! It's the work you WANT to do. And for Noah that is anything on the computer or ipod touch, or DS for that matter. If it has a screen he's into it.
As a result, I am always looking for educational games. I think I found something that will work. This site has math, grammar, geography, history science, nutrition, -- in game form. Some of which is in tutorial form first, like geography.