When I was in middle and highschool, I liked very few of ours. The Westing Game, though, turned out to be one of my favorites. I also liked The Cay and The Hatchet.

I wish I'd read Freak The Mighty in school! My school was overly strange about what we were and weren't allowed to read. -_- one of the bad things about an overly religious campus. They even disapproved of half of the books we were assigned.