Another huge help is to make friends with organized kids - DS got some hand-outs scanned/emailed to him from classmates, which is sometimes quicker than getting from the teachers.
This is a really good idea--I'm encouraging my DS to do this (get more friends' numbers so he can text or call). DD11 does it naturally. I was gobsmacked the first time I heard her on the phone with her BFF, going through a homework assignment they were both having trouble completing. Who knew kids do things like that?

The only thing is--it doesn't help with the #$%*& "doesn't turn in completed work" problem.
Last year, for awhile, I walked in with DS every. single. day. and put his homework assignments in teachers' mailboxes. That was before we had the "scan and email" accommodation added--and even a few times after, when there was so much that it was quicker to park and walk in with him.