From College Board: How Many Q#s You Need To Get Right For Your Desired CLEP Score!!

[Joeman200]

There is no one formula that blankets every test. You can do all the math you want you will never figure it out. You should never take a test because you think you only need to get X correct. Study and pass the test. I have saw calculations and calculations and I would be willing to bet none of them are correct. You need more then 40% of the questions correct on any test to pass. If 46/115 is good enough for credit then I certainly wouldn't feel any accomplishment at all on that test. I could probably pass that cold. These numbers are also from 2012-2013 I believe so they hold zero weight today.

sarg123 replied what I was going to say... each question has a different "weight" to the score. Also, a 50 is C grade or better... A+ students are not expected to get 100%... that's why 40% (of the questions) could be a pass and you can feel like you accomplished something, (that's because lets say hypothetically answering 70% correct translates to a score of 80 or an A+) It isn't like a normal exam where you get a letter grade, they expect you to get some wrong and then they calculate your equivalent level of knowledge. It varies from exam to exam, but in my biology case, 40% of questions right = a C grade. I heard here, C's get degrees. (in my case I got a B+)

I will say though, the links may be outdated and not have any weight, but I did want to explain the way it's scored... they don't expect 100%... (Still study for 100%... )