Two lanes of cars stretched bumper to bumper from the main entrance of Centennial Arts Academy as parents and other legal guardians waited in line to pick up their children at the end of the school day on a recent Friday. Alma Gonzalez clutched the hands of her children, 4-year-old Aida and 10-year-old Andy, as they walked on the curb of Century Place to meet with her husband, who parked outside the school grounds to avoid the late-afternoon rush. Gonzalez said she chose to enroll Andy, a fourth-grader, at Centennial, even though the family lives closer to Fair Street International.