I really recommend http://www.mathxl.com http://www.mathxl.com . I've used it for calc 3 and linear algebra in place of physically being in those classes. It wi

I really recommend http://www.mathxl.com http://www.mathxl.com . I've used it for calc 3 and linear algebra in place of physically being in those classes. It will walk you through examples and keeps track of your weakness to review later. It seems to be powered by Mathematica, from what I can tell.