Could a "Hall Monitor" Badge or a "Teacher's Assistant" Badge be created for users on SO which answer 10+ questions which are tagged as homework?
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Badges are supposed to encourage good behavior; why is answering homework questions better than answering other questions?
Hall Monitor sounds like a badge you'd give to over-active migrators (sending kids on their way to the right destination instead of hanging out and causing trouble), not to people who answer homework (what hall monitor helps people with their homework?).
If you were going to give a badge for it, and that's a tremendously big if, study aide or something like that would be more appropriate.