You might ask "Why the heck would I use an SAT book to review for the ACT?" It's simple - the "New SAT" is very similar to the ACT, so studying for one helps with the other, and the Barron's New SAT book has a very good, comprehensive math section, both on the test tricks used on both tests and the substantive mathematics you need to know (warning: the ACT you take will probably ask about trigonometric identities, whereas the SAT probably will not.). So here's a variation on the last prep plan I posted, with the Barron's book added as a resource.
Author: John Linneball Who did you think? ;-)
I'm the proprietor and only tutor for this business; that's why I named it after me.