What to you would be a fairly complete childhood education, without too many unnecessary subjects? For example:

Math (Statistics, Geometry, Linear Algebra, Calculus)
Finance (Investment, Accounting)
Shop (Carpentry, Welding, Blacksmithing)
Agriculture (Horticulture, Animal Husbandry)
Rhetoric (Public Speaking, Debate, Academic Writing)
Computers (Programming Languages, Server Administration, Linux)
Fitness (Marksmanship, Weightlifting, Running)
Cartography
Astronomy
Music
Lots of reading