Cash incentives for high school students to perform better in school are growing in popularity, but not everyone understands them. Does paying students for better Advanced Placement (AP) test scores encourage enrollment in AP classes? The author set out to determine the impact of a cash incentive program operating in a number of Texas high schools. The Advanced Placement Incentive Program (APIP) is a novel initiative that includes cash incentives for both teachers and students for each passing score earned on an Advanced Placement exam. Using data from the Texas Education Agency, the author evaluated how the APIP affected education outcomes in participating schools in the years following implementation. The author studied whether the program increased AP course enrollment and the share of students sitting for AP (or International Baccalaureate [IB]) examinations. According to the author's assessment, the incentives produce meaningful increases in participation in the AP program and improvements in other critical education outcomes. The author's evidence suggests that these outcomes are likely the result of stronger encouragement from teachers and guidance counselors to enroll in AP courses, better information provided to students, and changes in teacher and peer norms. (Contains 3 figures.)