The restructuring has been credited with improvements. To better allocate resources, Fenty and Rhee significantly reduced the school system's central administrative staff and closed 23 schools with low enrollments. After 2007, student achievement tests at the secondary level reportedly rose 14 points in reading and 17 points in math. Student SAT scores rose 27 points in 2010. Graduation rates rose each year since 2007, and 72 percent of District students took the Preliminary Scholastic Aptitude Test (PSAT), which functions as a practice test for college bound students. Fenty's administration had also taken on a major, five-year maintenance and construction effort to improve school buildings by 2014. Fenty and Rhee successfully negotiated a collective bargaining agreement with the Washington Teachers Union that establishes a system of performance-based teacher compensation.