Newbie - Can I pass the CLEPs?

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I've got a pretty good handle on the English Comp with Essay and the Analyzing Lit exams. I've armed myself with InstantCert and some other study materials.

Now here's the big question: Can you pass the CLEP just by studying (with no prior knowledge of the subject)? I'd like to hit the Western Civ I and II and the Intro to Psych exams. I am an adult learner and really need to maximize my credits.

Thanks for your advice!!