**Tons of ACT Science practice in an easy-to-use format—updated to match the latest exam requirements, and now featuring a 20-question Diagnostic Quiz** Practice makes perfect, and with *500 ACT Science Questions to Know by Test Day, Third Edition* , you’ll get a ton of practice—with hundreds of questions, smart test-taking tips, and a 20-question Diagnostic Quiz to help you track your progress. It’s the perfect way to sharpen your skills and build your confidence for test day. Organized by subject with detailed answers to every question, *500 ACT Science Questions to Know by Test Day, Third Edition* provides excellent practice to help you make the most of your review time. With small bits of information presented for quick and easy reference and smart strategies for test day, this essential study guide is helpful for all types of students, whether you’re looking for a thorough refresh of topics or need extra help understanding specific question types. Features: * 500 ACT Science questions and answers organized by subject, refreshed to match the latest exam requirements * NEW! 20 Question Diagnostic Quiz to test your knowledge * Written to parallel the topic and format of the science section of the ACT, accompanied by answers with comprehensive explanations * Ideal and effective practice to help build the skills you need