Choose a grade level, then select a practice test
www.iq.poquoson.org

Science & math games
http://education.jlab.org/indexpages/elementgames.php

Science & social studies games
www.solpass.org

Go to practice tests on the left side, then choose your grade level
www.virginiasol.com

Collection of games and lessons by subject
www.gamequarium.com