ACT is a nonprofit organization whose mission is to help people achieve education and workplace success. To help fulfill that mission, ACT offers school-day testing programs that provide all students with state- or district-funded access to its college readiness and admissions assessment, removing barriers to testing and opening doors to postsecondary opportunities. During the 2021-2022 academic year, over 1.3 million students, across all 50 states and the District of Columbia, participated in ACT school-day testing through state or district testing programs. Of these 1.3 million students, it is estimated that 59% could be considered members of underserved student populations according to at least one criterion. In this brief, the authors describe six evidence-backed benefits of school-day ACT testing: (1) Removes Barriers to Testing; (2) Increases the Number of Students Identified as College Ready; (3) Increases the Number of Students Who Are Contacted by Colleges; (4) Provides a Complete Picture for Research; (5) Leads to Improvement in College Enrollment; and (6) Provides Valuable Information to Students Navigating Different Paths.