At PrepScholar, we've written the largest set of high-quality SAT guides available, covering pretty much everything you need to know to improve your score on the SAT. They're all free and online, right here on our blog, and we think they beat any book you can purchase.
This guide, our Ultimate SAT Prep Study Guide, combines our most important SAT guides on one page. If you master all of the concepts linked to on this page, use them in your own practice and studying, and stay motivated to work hard, you'll have an amazing shot at improving your SAT score. Essentially, you'll have a huge advantage over students who don't know this information and lack the motivation to employ it in their own studying.