07-06-2015, 02:52 PM
The natural science CLEP is not hard but, it covers a lot of material. Subject count when I took the test was 22. Hippocampus, study, free-clep-prep, the REA book, and the CLEP practice test book are great to use. Took the natural science CLEP before I found out about InstantCert so, cannot say how good the flashcards are for this test. If overwhelmed by the amount of stuff needed to memorize, then switch over to the biology CLEP. The biology CLEP is 6 credits also.