The National Center for Education Statistics hosts a collection of games and tools for students. Dare to Compare is a quiz section of Kids' Zone where students can test their knowledge of civics, economics, history, geography, mathematics, and science. After taking each quiz the students are shown the correct answers. Dare to Compare also allows students to see the national and international average rate of correct answers.
XP Math is a good place to find math games, math videos, math worksheets, and math e-books. The games section of XP Math offers games for basic arithmetic, algebra, geometry, and probability. Create an account on XP Math and you can keep track of your scores.