CLEP info systems and comp analysis

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now that i'm done with my first exam, i need to move on with my next one, which is...info sys. and comp analysis >.<

i'm not sure what to think about this exam b/c even though the general consensus is that this exam is "easy", i've seen in recent posts that people aren't happy with their results or are surprised about their score. so can anyone tell me what other materials you use besides IC? ie: which additional books? programs? ...so far i only have IC, collegeboard book, and the free peterson exams. but i'm not sure if that's enough to pass the exam.

thanks so much! =]