I wish someone would test spaced repetition software for high schoolers or undergrads. That even has the excuse of everyone needing a PC or a tablet to do it, and we being able to easily afford that only recently, for why it hasn't been done before. Mnemonics are great for quick low-effort cramming for remembering things overnight, but spaced repetition can be for life.
I'm having trouble coming up with any complex instruction given in schools that doesn't directly lead to being tested in an exam. Can think of very few lessons in any sort of metacognition, some half-hearted mindmap thing mostly, and none at all where a specific metacognition method was being used in concert with an actual course.
I wish someone would test spaced repetition software for high schoolers or undergrads.
What makes you think they haven't? When I look through the cites in http://www.gwern.net/Spaced%20repetition the majority of stuff was done with students of various age levels between elementary & college.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.