Here are materials for an eight-week SAT math prep course.
The web exercises on this page test your understanding of the second week's material.
The two files listed below are pdf files—choose the one suited to your needs.
I recommend you print it, read it, mark it up, and do all the practice problems.
This page then gives you unlimited additional practice with the second week's material!
(The material herein was accurate in 2008.
Be aware that policy and coverage things are subject to change.
The math, however, is eternal.)