The things you should practice for the SAT are only authentic test preparation materials made by the test makers. SAT materials can be found at www.collegeboard.com; often, you can obtain these materials at no cost. You can find full-length practice tests through the College Board website or in their SAT practice book. Take a few timed tests, and you will see a difference in your scores. The SAT has three parts: Critical Reading, Math, and Writing. If you’re trying to strengthen the Reading and Writing parts, the best work you can do is read difficult 19th and early 20th century British and American literature. It would help if you also were working on vocabulary. You can also visit these websites for practice materials - http://www.inlikeme.com/test/preparing-sat-and-act.html, http://sat.collegeboard.org/home, and http://www.number2.com/. The best SAT prep materials to use are:
Best SAT books
SAT Reading practice
SAT Writing and Language practice
SAT Math practice
SAT Question of the Day