The Dickson County school system had an overall graduation rate of 90.3 percent for the 2011-12 school year, according to figures presented by Director Dr. Danny Weeks at last week’s school board meeting. Weeks said the final figures show graduation rates of 95.3 percent for Dickson County High School, 93 percent for Creek Wood High School and 59.7 percent for New Directions Academy. The director explained that graduation rates are determined by the number of students who enter their freshman years in the school system compared to the number of graduates four years later. That requires the school system to track all students who leave or enter the school system during their high school years. “When a student enters the ninth grade, the clock starts ticking,” Weeks said. “They have four years and one summer to graduate.” Weeks said many factors impact graduation rates and the system will eventually reach a maximum level but said he doesn’t believe the Dickson County system has “plateaued” yet. Weeks said the system’s challenge is to improve graduation rates 1-2 percent each year.