10 Things Millionaires Won't Tell You

7. "I was a B student."

Mom was right when she said good grades were the key to success — just not necessarily a big bank account. According to the book "The Millionaire Mind," the median college grade point average for millionaires is 2.9, and the average SAT score is 1190 — hardly Harvard material. In fact, 59 percent of millionaires attended a state college or university, according to AmEx/Harrison.

When asked to list the keys to their success, millionaires rank hard work first, followed by education, determination and "treating others with respect." They also say that what they absorbed in class was less important than learning how to study and stay disciplined, says Jim Taylor, vice chairman of the Harrison Group.