When it comes to financial literacy, you're never really done learning.
April is Financial Literacy Month, and studies still paint a grim picture about how poorly educated Americans are when it comes to managing our money. In the first large-scale international study of 15-year-old students' financial literacy skills, released last summer, the U.S. ranked at best eighth and at worst, 12th, out of 18 countries participating.
Adults haven't fared any better. In a Retirement Income Literacy Survey conducted for The American College of Financial Services last year, 80 percent of the respondents received scores of 60 or lower on financial questions about retirement. Just 20 percent received what amounted to a passing grade.
Read More8 important money questions many people can't answer
The results are just as dismal when it comes to general financial knowledge. Asked five multiple-choice questions about topics like interest calculations, mortgage payments and investments, just 39 percent of the 25,509 adults answered at least four correctly, according to a 2012 survey from the FINRA Investor Education Foundation. That was down from 42 percent in 2009. The survey is done every four years. (See chart below for a state-by-state analysis.)