CBO 2025 - tentative date

The 2025 CBO competition is tentatively scheduled for Thursday, April 10. Deadline for registration will be around March 22. 

The CBO test will take place at your school and the exam will need to be supervised by a teacher. Schools and students will need to register.

Details about the competition will be available later in the fall, registration will begin in the new year.

2024 competition 

Details about the 2024 competition can be found here or on the main page.

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 that we currently do not have.