Get a copy of the CLEP exam guide for the exams you would like to take. These exam guides are official publications of The College Board. The 2010 prices are $10 per guide. Use the guides for sample practice questions and test-taking strategies. You can also purchase the latest "CLEP Official Study Guide." The official guide is a compilation of all the individual exam guides. Purchase the official guide if you intend to prepare for at least three CLEP examinations. The 2010 price of $24.95 is cheaper than buying three individual guides.
Buy textbooks related to the CLEP subject exams. The College Board designs CLEP tests to determine if the CLEP test takers have the same kind of knowledge as a student who actually took classes in that subject. Use The College Board's list of recommended textbooks for each subject exam. Follow the links under "Subject-Specific Resources" to find the textbooks for each subject.
Read through the textbooks as if you need to learn everything for a final examination in a real class. Make an outline of key information as you read through the textbooks. Use that outline for review purposes in the days leading up to your test.
Get more preparation with PassYourClass CLEP study guides. Unlike the official study guides, you can prepare for the CLEP tests with actual study lessons. Use commercial study guides to hone in on the most important material for each test. No study guide will completely replace the study of actual textbooks. However, these guides work great as a review of highlights after reading the textbooks. Each guide also has more sample CLEP questions to use for practice. As of 2010, prices are about $36 for each exam study guide.
Practice with free questions at the 4Tests website. Click on the subject and take the practice questions on the next page.