Academy of Holy Angels - A Catholic, co-educational high school serving over 700 students in grades 9-12. Contact information, news items, educational philosophy, activities. Augsburg Park Montessori School - Home-based school, with open enrollment, for children ages 2-6. The staff's qualifications, a description of the curriculum, hours, how to apply. Watershed High School - Public charter school offers a Waldorf education for grades 9-12. Richfield Senior High School - Public school. Home of the Spartans. Centennial Elementary School - Public K-2 school. Home of the Cougars. Richfield Middle School - Public school for boys and girls in grades 6, 7, and 8. Sheridan Hills Elementary School - Profile, classrooms, office and resources.