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Cornerstone Montessori Prep School vs Keystone School.

Side-by-side comparison of two Toronto private schools.

Cornerstone Montessori Prep School

Cornerstone Montessori Prep School

Toronto, ON

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Keystone School

Keystone School

Toronto, ON

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Detailed Comparison

Cornerstone Montessori Prep SchoolKeystone School
Annual Tuition$17,500$21,300
Boarding Tuition——
GradesPreschool to 12Grade 6 to 12
CurriculumMontessori, AP, ChristianIB, Ontario Ministry of Education, Project-Based Learning
Enrollment11085
Avg Class Size1112
Student:Teacher—10:1
Gender PolicyCo-edCo-ed
Founded19952011
BoardingNoNo
Financial AidNoYes
Acceptance Rate100%65%
SportsVarsity SportsPhysical Education
ArtsMusic, Visual ArtArt Club, Arts & Innovation Scholarship Track
SpecializationsMontessori, Gifted, AP, TrilingualInternational Baccalaureate, Online High School, Project-Based Learning, Experiential Learning

Comparison Highlights

  • Tuition difference: $3,800/year
  • Class size difference: 1 students
  • Cornerstone Montessori Prep School has larger enrollment (110 students)
  • Both schools are located in Toronto

Source: NextSchool verified school database

Last verified June 3, 2026Sources: NextSchool verified profilesData-driven comparison — no paid placements

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