Amir Mousavi, Tutor, Dog Lover, Yogi
I would also check out some of the free online resources. A couple sites to check out are Khan Academy (https://www.khanacademy.org) and The ANA Project (http://www.anaprojectprep.org).
In terms of study tips for the math section, I would highly recommend keeping track of problems you get wrong/give you trouble and revisit them to make sure you fully understand them. Many students make flash cards of these problems which is an excellent study tool.
The SAT also tests the same types of questions regarding the same concept over and over and over again, so its very important to understand them so you won't keep getting the same question types incorrect. For example, if you get a question special right triangle (30-60-90 or 45-45-90) problem wrong, make sure you understand the concept, because you will likely see it pop up again. Hope that helps!