Keystone School
Ontario Secondary School Diploma. The high school diploma in Ontario. Students need 30 credits, 40 hours of community service and the literacy requirement (usually the OSSLT). GlossaryAlso teaches online
- Grades
- Elementary and high school
- Students
- Co-ed
- Day tuition
- $21,300
- Apply by
- Ask the school
- Boarding
- No
Tuition and admissions
Day tuition 2026–27
$21,300
Grades 6 to 12. Plus $1,250 in resource and activity fees. New students pay a one-time $3,000 registration fee.
From keystoneschools.ca, checked Sat, November 14, 2026. Fees for 2027–28 aren’t posted yet; most schools set them in January.
School details
GradesElementary and high school
Ontario Secondary School Diploma. The high school diploma in Ontario. Students need 30 credits, 40 hours of community service and the literacy requirement (usually the OSSLT). GlossaryOffers credits
ClassesIn person and online
StudentsCo-educational
A group of private schools that set standards for members, such as CAIS or CIS Ontario. Membership is a sign of outside review, but many good schools don’t belong to one. GlossaryOntario Federation of Independent Schools
The number the Ontario Ministry of Education gives every school. Use it to look up a private school in the Ministry’s list. Glossary 888468