When it comes to the SAT, there is no substitute for preparation and practice. SAT prep books can give you both. Most prep books offer test-taking strategies and SAT practice tests. Get a good SAT prep book and you will most certainly increase your score. Here's a list of some of the best SAT prep books on the market.
The Princeton Review is known for great test prep books and their SAT guide is no exception. Cracking the SAT offers comprehensive information on each section of the SAT and also includes full-length practice tests. Though the book leans more towards strategy than actual practice, you can still find many valuable tips that will help you ace the SAT.