CBO 2025
Details about the 2025 competition are available here.
Suggested labs
The exam will have approximately 40-50 questions and will be 1 hour in length
Like the IBO, the level of questions will be based on information in Campbell Biology. Many of the questions will be application questions.
To get an idea of the types of questions, you can work through old IBO past papers available here: https://www.ibo-info.org/en/info/papers.html
Note: Some of the papers (2019-2021 for example) require a password, email us to obtain it.
