I'm looking to brush up on SAT math. (That's basic algebra, probability and trigonometry.)
I'm interested in books and websites.
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It only takes a minute to sign up.Sign up to join this community
I highly reccomend the Princeton Review series of prep books, they have worked wonders for me. The College Board website also has a lot of useful tools, such as a complete free test that you can take online, and sample questions. http://sat.collegeboard.com/practice
I'm not familiar with SAT, as I'm not from USA, but you might find this useful: http://www.khanacademy.org/
My guess is that this guy explains all of the subjects you might need. It might lack exercises though, but it might be worth checking it out if you need to review a subject.
Check out the new kid on the block: https://lemmaprep.com. All substantive content matter questions are answered directly by the Lemma staff.