I took it a few months ago only using REA clep and scored a 60. The REA book was enough but i got tutoring when i was stuck on a problem. The test had many more graphs on it than the REA book had; asking you pick which out of four graphs represented the sample. I guessed on all the graphs and the rest of the math i knew because of the REA book. The math wouldn't work in this format with flashcards. You just have to be able to work the problems. Good luck.