<p>There are quite a few good resources. For instance, I always recommend the on-line Sparknotes SAT prep ([SAT:</a> Improve SAT Score with SparkNotes: Introduction](<a href=“SparkNotes: Today's Most Popular Study Guides”>SparkNotes: Today's Most Popular Study Guides)), especially for writing. There are also practice exams on Sparknotes.</p>
<p>Silverturtle’s guide (<a href=“http://talk.collegeconfidential.com/sat-preparation/955109-silverturtles-guide-sat-admissions-success.html[/url]”>http://talk.collegeconfidential.com/sat-preparation/955109-silverturtles-guide-sat-admissions-success.html</a>) is top-notch, too, for writing and critical reading. </p>
<p>More recently, I’ve been using [Number2.com</a> :: Free Online Test Prep](<a href=“http://www.number2.com%5DNumber2.com”>http://www.number2.com) with the people I tutor. It’s a free online interactive site, and I particularly like its vocabulary prep. I could care less for its sentence completion section.</p>
<p>Unfortunately, I don’t know of any internet math resources. What I can say, though, is that the absolute best way to improve your math score–SAT score in general, really–is through practice exams. You should try to focus on official released CollegeBoard exams, which you can find on the CollegeBoard website, or even just any bookstore in your area.</p>
<p>I hope that helps. 
Good luck!</p>