They are succeeding. According to a report by Hanover Research, which examined the results of students whose schools used CTL’s PSI curriculum, “PSI students were 4.4 times more likely to participate in the AP Physics B exam than New Jersey students, and 5.4 times more likely … than students across the U.S. These higher participation rates are especially notable among African American students: PSI African American students were 8.7 and 10.8 times more likely to participate in the exam than African American students within New Jersey and across the U.S., respectively.â€