The College Board doesn't mention that the AP program, a series of tests designed to award credit and/or class standing by participating colleges and universities, covers the same general course material as the CLEP exams, much less the DSST program. Nonetheless, a quick peek at the admitting institution's policies will prove that it's so. Therefore, AP study materials are perfectly adaptable to the CLEP and DANTES exams and vice versa.
It is also a little-known fact that the AP exams can be taken whether or not one has attended an AP course in high school. In this respect they are challenge exams just like the CLEP or DSST tests
Using Amazon's search with the AP subject names in this section is pretty much useless (...unless they've fixed it. You could try.). The best we could do was to provide some links to popular publishers. You'll have to scroll through them to find the appropriate test. Alternatively, you could try the Alexa Toolbar, which returns Amazon book links as ads down the right side of the page. (Use it to search for "AP + <testname>".)
