An online graphing calculator which allows users to graph functions, plot data, evaluate equations, explore transformations, and much more – for free!
KhanAcademy provides free courses, lessons, and practice on a comprehensive list of math courses.
This site provides over 5,000 free mini-lessons and example videos with no ads. The videos are organized by course and topic.
SAT Practice Test
Taking a full-length SAT practice test is one of the best ways to simulate test day. Eight official SAT practice tests are available for free, both online and on paper.