Links
Here are many tests to practice math, language arts, social studies, and more.  There are also links on this site to fun activities.
http://www.henryanker.comweeblylink_new_window

Practice math with many fun activities (elementary to high school level math):
http://www.shodor.org/students/activities/weeblylink_new_window

Want a tutor?  Here is a great website with an online tutor that explains math from elementary to college level:
http://www.khanacademy.org/weeblylink_new_window