<p>I did that last year: I took the SAT 2 Bio M in June after the AP test. I thought the SAT Bio was a breeze, but it surprised me about how much more material it covered on the test. The AP Bio exam is mostly on basic topics, but the SAT Bio covered more obscure topics, like the anatomy of other animals (but it’s pretty much common sense). However, it wasn’t really much of a difference- the AP test was just a lot easier and simplier than I imagined. I don’t think you need to do any extra studying after the AP test…just make sure that the bio information stays fresh in your memory for the SAT Bio.</p>