Free ACT Math Practice Test http://www.mometrix.com/academy/act-math-practice-test/
5 Sources for free ACT test prep!
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Math = Love: Stuff Worth Sharing: Free ACT Prep Materials
Accuplacer - Mathematics 2 Practice Questions
Excellent practice test site - Free! :) Has Educational Exams: ASVAB, ACT, SAT, etc... Computer Exams: MCSE, MCSD etc... Professional: Legal, Medical, Accounting etc... And some extras, like IQ and movie quizzes. Great Resource!
number2.com-a good website to visit if you're trying to prepare for the SAT, ACT, or GRE. It's totally free. You just set up an account, and you can study vocab words, math, etc. on this website.