Grades: K-12 Enrollment: 130 Average Student-Teacher Ratio: 10-1 Tuition: $8,500-$10,500 To develop true scholars, life-long learners, and productive citizens of the world in a diverse atmosphere that incorporates Montessori principles where students demonstrate respect and love for self, others, and their environment. The private, non-profit school educates students ages 18 months to 18 years.