Correct me if I'm wrong, but...

[MA2]

Now here's the tricky part:
If you randomly selected ALL of the answers on a clep test, you have exactly a 50/50 chance to pass or fail. Keeping that in mind, if you study a certain topic, and become knowledgeable of let's say 25% of the subject, and completely guess the rest, you can be reasonably assured that you will get more than 50% of the questions correct, right? Am I making any sense at all here?

Even assuming what you said could actually happen it still isn't true.

If you studied 25% percent of a subject, and somehow got 25% of the questions right without guessing, and then guess on the rest, you still wouldn't hit 50%, and even if you did, 50% correct isn't likely to pass.

100 question exam, you know 25 answers, leaves 75 left. By guessing on the rest, you would get roughly 1 in 5 right. That's 15 more correct answers, for a total of 40 right out of 100. Fail?

Yes, fail.