Another great site for help in high school math is Math Planet. They offer lessons, examples, and explanations that every math student needs at some point in high school. One unique attribute of this site is that many areas of mathematics have video lessons. In addition, Mathplanet.com offers SAT and ACT tests with separate downloadable answer keys.
These are just a few of the better websites that provide help in high school mathematics. Each one provides lessons, explanations, and resources that will assist students, parents, and teachers like you in achieving success to prepare for the future.