The Upper School (grades 9-12) follows a One Subject Plan curriculum that has been found to greatly improve its students' academic achievement. Instead of a student taking 4 to 6 different classes each day, the academic year is divided into five grading periods of approximately 7 weeks each. Each grading period the student takes one class, all day, each day, for that grading period. This allows students to learn in depth, develop a strong bond with their teacher, and learn valuable study skills that will help in college. Teachers are responsible for only one class of students at a time. Instead of managing 60 to 150 students in multiple classes, a teacher has only 10-20 students total in any one grading period. This provides for intensive individual attention.