Ehm. They teach a money management all through high school, and most colleges require a basic education in it, too.
It's called 'math'.
You learn about compound interest and whatnot in basic math classes. That takes care of interest. You learn addition in grade school. I remember doing multiplication tables in third grade. Seriously, people, I am not a numbers person and I am a fantastic budgeter, to the point where I was able to survive several months of unemployment with very little savings (much less than I would have preferred). It's not that difficult.
I do agree about the tax forms, though. For me, I just thought I could keep claiming 'exempt' if I was under a certain budget. Hoo, man...