Packed with hands-on activities, real-life examples, step-by-step lessons, targeted practice exercises, and effective test-taking strategies, this e-book reviews the fundamental concepts of biology in just 4 weeks, in 20 quick and easy lessons. It includes pre- and post-tests for identifying strength and weaknesses and assessing progress. Bonus chapters provide a glossary, additional resources, and tips to help prepare for important standardized tests such as AP biology and SAT subject tests.