CollegeBoard, the company responsible for administering and scoring the SAT, has a wealth of resources to help prepare for the test. Most of the resources are free and can be found by clicking here.
If after putting forth a strong effort in using the free resources you feel you need more SAT Prep, there are several additional resources and things to consider.
1. Junior Year PSAT- This is the most important PSAT students take since it takes places in the Junior Year and leads right into taking the actual SAT in the spring semester.
2. Intense prep for the SAT should not start until 6-8 weeks prior to the actual test date in order to ensure that the principals/strategies are fresh in one's mind.
3. Complete a practice test- one of the free resources on the CollegeBoard website are full-length practice tests. Even better, take a practice test on a Saturday morning close to your actual test date. Part of the issue with the SAT is that you are being tested within a context that is not normal. Preparing this way will make the experience more familiar.
4. Know the Content- On the Math section, Algebra I and Geometry comprise nearly 100% of the content on the test. There are a few questions dealing with some elements from algebra II. The multiple-choice questions in the Writing section test some of the basic elements of grammar, which most students need a refresher on.
5. More Prep- if you think you would benefit from additional test prep, local community colleges often run SAT Prep courses at a fraction of the price compared to the bigger test prep companies.