If paper organizers, homeword diaries, etc., don’t seem helpful, you might give this new online organizer a try.
MySchoolog.com is completely free and multilingual, including versions in several European languages as well as Chinese and Japanese. (If you are a Korean you might volunteer to help create a Korean version of the site.)
I haven’t tried this myself, but the development team certainly looks like an interesting group of people. If you give it a try, leave a comment here and let us know what you think.