"Math Galaxy SAT Math" reviews all math topics found on the SAT, with extensive explanations, practice problems, and videos.
To be fully prepared for the test you need to work through practice problems, view the videos on topics where you need a refresher, and do as many practice tests in the College Board's "Official SAT Study Guide" as you can. Remember that the SAT is not the only factor in college admissions, so do your best but don't obsess over it.