What math textbooks/websites should I use for the new SAT?

I am an international student who plans to take the new SAT (especially as I’ve heard that it’s easier) I haven’t touched a math textbook in years - what should I use in order to prepare for the new SAT?

www.KhanAcademy.org/sat

it’s free!

I’ve already checked out that site, but it’s mainly practice tests and quizzes (which are great, but not what I am looking for) I need instructional material and textbooks. :slight_smile: