Past Papers
Past Papers
Explore released CAAO problems by division and year. Past papers are useful preparation resources; examination formats and instructions may differ between years.
Official CAAO solutions are not published on this page.
Junior
| Year | Paper or stage | Problems |
|---|---|---|
| 2026 | Junior paper | Download 2026 Junior problems (PDF) |
| 2025 | Junior paper | Download 2025 Junior problems (PDF) |
| 2024 | Junior paper | Download 2024 Junior problems (PDF) |
| 2023 | Shared Junior and Senior paper | Download 2023 shared paper (PDF) |
| 2022 | Junior section, PDF pages 4-5 | Download 2022 problems, Junior section (PDF) |
Senior
| Year | Paper or stage | Problems |
|---|---|---|
| 2023 | Shared Junior and Senior paper | Download 2023 shared paper (PDF) |
| 2022 | Senior section, PDF pages 1-3 | Download 2022 problems, Senior section (PDF) |
A separate 2024 Senior paper is not available here.
Additional Papers
| Year | Paper or stage | Problems |
|---|---|---|
| 2026 | CAAO Camp Exam 2026 | Download CAAO Camp Exam 2026 (PDF) |
| 2025 | CAAO 2025 | Download CAAO 2025 (PDF) |
CAAO 2025 is labeled with the document’s own name. It is not classified here as the Senior paper. CAAO Camp Exam 2026 keeps that cover title.
Supplementary material
Earlier CAO Papers
| Year | Paper or stage | Problems |
|---|---|---|
| 2021 | CAO paper | Download 2021 CAO problems (PDF) |
| 2020 | CAO paper | Download 2020 CAO problems (PDF) |
| 2019 | CAO paper | Download 2019 CAO problems (PDF) |
| 2018 | CAO paper | Download 2018 CAO problems (PDF) |
| 2017 | CAO paper | Download 2017 CAO problems (PDF) |