sentences:  The Lower School consists of a preschool program, for ages 2–5, and Kindergarten through Grade 4.The Middle School covers grades 5-8, and the Upper School has grades 9-12, like a traditional high school.The Upper School offers 17 Advanced Placement courses, and 85% of seniors who took an AP class earned a score of 3 or higher with 60% being designated as AP Scholars; two were National AP Scholars.