With an annual yearly growth rate of 9.3 percent over the last two decades, Advanced Placement courses have become a juggernaut in American high school education. AP courses are routinely perceived as an indicator of educational rigor, and many schools push to enroll low-income or minority students in these courses in the hope of preparing them for success in college-level courses. This rapid expansion of AP courses raises important questions. What are the advantages and disadvantages of courses geared toward the AP exams? How well do AP courses prepare students for college-level work or predict students' success in college? Should colleges award credit for AP courses? Is the AP program a cost-effective tool for closing the gap between students in privileged and struggling communities?