Perhaps the best course I had in high school -- and it was an elective that I sort of fell into -- was a personal finance course, covering things like balancing a checkbook, filing income taxes, keeping a personal budget, etc.

In The Children's Machine, Seymour Paper wrote:

[O]n my reckoning, the fraction of human knowledge that is in the [school] curriculum is well under a millionth and diminishing fast. I simply cannot escape from the question: Why that millionth in particular?