Two things could definitely stand to be adopted from the Japanese school system:
Japanese class (or another foreign language, taught from an early age; the Japanese are taught English from I believe 5th grade onward)
Kendo class (because hitting other people with things is a) a workout and b) cathartic. Less stress=better tests.)
There are other ideas, but those are the two that are really important to me.
[sup]Disclaimer: Much like katanas and revolvers in relation to other swords and guns, the Japanese are not automatically better than their American counterparts at everything. Their schooling, however, is far superior to America's public schools, as far as I can tell. And, let's face it: video games came from Japan. They've got to be doing something right.[/sup]