Based on the first cohort of students who took the PreACT® in 10th grade and the ACT® test in 11th grade, this study examines the effects of PreACT adoption on ACT test scores, participation in challenging high school courses, interest-major fit, and college score sending behavior. Adoption of the PreACT led to an increase in ACT Composite score of 0.23 score points, which is comparable to one month of instruction. Adoption of the PreACT also led to small increases in interest-major fit and out-of-state score sending.