Decent practice tests but sloppy explanations,
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This review is from: CLEP Natural Sciences w/ CD-ROM (CLEP Test Preparation) (Paperback)
Here's my bottom line recommendation: Buy this book for its practice tests, but find something more user friendly for content. This book has exam questions that are very similar to those on the actual CLEP. In my mind that makes the book a worthwhile purchase, especially with the testware's instant scoring feature.
Unfortunately, the written explanations are lacking, and even frustrating. Technical terms are used before they're explained. Mistakes appear occasionally. The most maddening issue is the highly frequent appearance of concepts in the test questions that are nowhere explained in the body of the text. I would suggest getting a "For Dummies" book as a supplement.