With revision and mini tests for every topic, it's easy to check whether you've mastered a topic or subject. Collect three stars on the exit quiz to earn your mastery crown and unlock the next unit. Your memory will fade over time, so check the app to see when it's time to refresh your knowledge. Retake the exit quiz when the memory strength bar for the unit turns yellow. Each time you retake an exit quiz, the memory strength bar will be refilled and will decrease more slowly than before. This helps push knowledge into your long-term memory, ready for formal assessments and to prepare you for whatever you do next. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
