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Graduate Educational Information Service: Test Prep Review
Contains great information to help students prepare for many national standardized tests, including the SAT, PSAT, ACT, GED, and many others. Along with tips and strategies, there are a number of free practice tests.
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4 Tests: Your Online Practice Test Site
Free on-line ACT test allows you to see your answers and explains the ones you got wrong. This site also includes practice tests for the GED, SAT, TOEFL, and many other exams.
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Act Assessment Homepage
Official site of the ACT, it includes test dates and sites, sample questions, online registration and score requests, test taking tips, and scoring information.