Willingham & Morris, 1986; UT Study 1988
From Facts About the Advanced Placement Program:
Because AP brings high educational standards into high school classrooms, colleges benefit by admitting increasing numbers of better prepared students. As numerous studies show, AP students outperform their peers who have not taken AP on virtually every standard. Students whose AP grades exempt them from introductory college classes typically do better in subsequent higher-level courses than those students who actually take the introductory college courses. AP students who receive credit and/or advanced placement are more likely than other students to take additional college courses within the academic discipline of their AP course work.