Just took my first Clep exam yesterday. The microeconomics. Studied a total of about 12 hours for it. Mostly used the REA book from 2007 and watched ACDC AP microeconomics videos on YouTube(I found unit 4 to be most helpful). I found the test pretty easy as I only had a very basic understanding of economics beforehand(basic supply and demand). I made a 76, and I feel as if most of the ones I missed were in the last 10. I definitely recommend this exam if you’re looking for a pretty easy one.