The best material(s) to study to ensure I past the principles of marketing clep??

[clep3705]

So what if you don't know an answer to a question? Expect to miss some. Or more than some. You need C- level competency to pass. You can miss quite a few.

No one can tell you how long to study. Everybody is different. Do you have the official CLEP study guide book? If you can do well on the practice test in that book, it would be a good sign.