Test preparation plays an important role in high-stakes standardized testing. While test preparation companies may claim large, at times unrealistic, gains associated with product use, much of which can be very costly, scientific research supports a more moderate impact of test preparation. ACT offers a number of test preparation opportunities for students who are planning to take the ACT® test. ACT's test preparation suite of solutions includes the Official ACT Prep Guide, ACT® Academy™, ACT Online Prep (AOP), ACT Rapid Review Live, ACT Rapid Review On Demand, and ACT Rapid Review All Access. Each of these solutions caters to different student learning styles and strategies. In this study, the author focuses on student's usage of AOP. AOP provides two learning paths for students. The first is structured, comprehensive coverage of all subjects at all levels regardless of student's starting point. The second is an adaptive learning plan based on input from diagnostic tests to identify areas of weakness to target first. AOP presents official ACT test materials in a format that ensures students can cover all content areas tested. The current study sought to examine the score gains students have attained between official ACT test administrations when using AOP between the tests.