The hack is here, under sims 2, fixes, freetime fixes: http://www.simwardrobe.com/ (can't link directly, which is stupid).

Well, yeah, the other teens' homework doesn't matter since they can't work anyway, and the only two things you need good grades for are college and being able to work - if they have an F they'll refuse to hold down a job. (Things you learn from doing an apocalypse.) Still curious about secondary Knowledge teens - are they allowed to go to college or do they have to suffer?

Yeah, a poll seems like the way to go here, though obviously picking from a hat would be hilarious.