http://www.gaexperienceonline.com/

This practice site lets students see what testing online is like. Parents and educators are welcome to try it too. The items on the demonstration tests are general and are organized into three grade bands: Grades 3 – 5, Grades 6 – 8, and High School in the content areas of English Language Arts, Mathematics, Science, and Social Studies. The items do not necessarily represent the specific grade-level content that students learn daily in their classrooms. The primary purpose is to let students experience, firsthand, the functionality of the online testing platform. The sample tests are not graded, so have fun!