Glad you joined! This site makes things so much more enjoyable!

You definately can pass the Info. Systems CLEP. I used some computer book to study for this test (don't know the name of it -- but it shouldn't be too hard to find something).
Anyway, you don't have to know everthing to pass a CLEP -- but you do need to know basics. Peterson's does have a practice test -- and I would be sure to get in the 40% range correct before taking the actual test.

On the actual CLEP - go through the entire test: answer the questions you KNOW - mark the questions that are too long/that you don't know. After going through the entire test, click "review" - and answer the checked questions. If you do this- you won't get freaked out about the time-limit.

You can do it!!