The free version includes quizzes on these topics: * Matter * Geology * Astronomy * Weather * Chemistry * Physics * Biology * Experimental Method * Periodic Table * Energy This is a great way to review for standardized tests for 6th, 7th, and 8th grade students in middle school and junior high. For 5th graders, it's your chance to get a head start. * Practice using three levels of words for each quiz * Replay levels to improve your scores and speed * Compete with friends with leader boards and achievements * Aligned to Common Core State Standards * Review using built-in help * Email your progress to your teacher