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ACT Online Prep™ The only test preparation program designed exclusively by ACT test development professionals!
The official ACT prep guide that includes five actual retired ACT test and optional Writing Tests.
Preparing for the ACT or Preparación para el examen de ACT (PDF; 72 pages, 2.1MB)
A free student preparation booklet available from most high schools and colleges—includes test information, complete practice tests with scoring keys, and a writing prompt.
McGrawhill Test Prep
Number Two Test Prep
Prep Factory Test Prep
ACT eBook