The average class size is 8 students and 62% of the faculty hold advanced degrees. The faculty averages 12 years of teaching experience. In 2016, five students gained National Merits status. Classes are taught in the traditional fields of history, English, mathematics, science, and foreign languages. All students are required to take three years of a foreign language before graduating. For foreign language requirements, Spanish, French, and Latin may be taken by students. The school offers many electives, including podcasting, glassblowing, writer's workshop, drawing and painting, ceramics, Ancient Greek, photography, a training kitchen and many others. In May 2018, 98 Upper School students took 197
Advanced Placement examinations; 85% scored 3 or better. Harley's 2019 students averaged 0.74 points higher than the national average (1-5 AP Scale) across all AP exams offered. ==Students==