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Best secondary schools in York CDSB (2025)

Secondary (high) schools and combined schools. Ranked by the Success Index (Canada) from official Canadian data; 15 schools in York CDSB, Ontario. Rank positions shown on each profile are within Canada and Ontario.

  1. 1
    88
    St Theresa of Lisieux Catholic High SchoolRichmond Hill · Catholic Secondary97% OSSLT pass rate · 1,590 students
  2. 2
    84
    St Robert Catholic High SchoolThornhill · Catholic Secondary96% OSSLT pass rate · 1,705 students
  3. 3
    82
    St Augustine Catholic High SchoolMarkham · Catholic Secondary96% OSSLT pass rate · 1,575 students
  4. 4
    77
    Cardinal Carter Catholic Secondary SchoolAurora · Catholic Secondary93% OSSLT pass rate · 1,375 students
  5. 5
    77
    Our Lady Queen of the World CA High SchoolRichmond Hill · Catholic Secondary93% OSSLT pass rate · 1,200 students
  6. 6
    76
    St Brother André Catholic High SchoolMarkham · Catholic Secondary94% OSSLT pass rate · 1,280 students
  7. 7
    76
    Father Bressani Catholic High SchoolWoodbridge · Catholic Secondary91% OSSLT pass rate · 1,405 students
  8. 8
    69
    Father Michael McGivney Catholic High SchoolMarkham · Catholic Secondary91% OSSLT pass rate · 1,170 students
  9. 9
    68
    St Elizabeth Catholic High SchoolThornhill · Catholic Secondary92% OSSLT pass rate · 1,065 students
  10. 10
    64
    St Maximilian Kolbe High SchoolAurora · Catholic Secondary87% OSSLT pass rate · 1,245 students
  11. 11
    60
    Holy Cross Catholic Academy High SchoolWoodbridge · Catholic Secondary79% OSSLT pass rate · 1,295 students
  12. 12
    60
    Sacred Heart Catholic High SchoolNewmarket · Catholic Secondary85% OSSLT pass rate · 1,240 students
  13. 13
    55
    St Jean de Brebeuf Catholic High SchoolWoodbridge · Catholic Secondary85% OSSLT pass rate · 1,510 students
  14. 14
    55
    Our Lady of the Lake Catholic Academy High SchoolKeswick · Catholic Secondary84% OSSLT pass rate · 320 students
  15. 15
    49
    St Joan of Arc Catholic High SchoolMaple · Catholic Secondary82% OSSLT pass rate · 975 students

St Theresa of Lisieux Catholic High School in Richmond Hill leads the 2025 list of secondary schools in York CDSB with a Success Index (Canada) of 88.0. Of the 15 schools shown, 15 are catholic.

For the full picture see the wider Ontario secondary schools rankings, every school on the York CDSB page, or the comparison tool to put a shortlist side by side.

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Frequently asked questions

What is the best secondary school in York CDSB?

St Theresa of Lisieux Catholic High School in Richmond Hill, Ontario ranks first among secondary schools in York CDSB with a Success Index (Canada) of 88.0 out of 100 (Enrolment: 1,590).

How are secondary schools in York CDSB ranked?

Each school's Success Index (Canada) combines 8 factors: eqao grade 3 (reading, writing, maths) (20%), eqao grade 6 (reading, writing, maths) (25%), eqao grade 9 mathematics (25%), osslt first-attempt pass rate (20%), fsa literacy score (25%), fsa numeracy score (25%), community advantage (fewer low-income households) (10%), parent education (fewer parents without a credential) (10%). Each factor is a percentile against schools of the same type across Canada. Schools with fewer than 60 students are excluded from rankings.

Are these 2025 rankings official?

No. They are computed by Success Tutoring from official Canadian data (Ontario – School information and student demographics; BC Data Catalogue – Foundation Skills Assessment). Provinces publish different assessments, so scores are comparable within a province, not between provinces.