CBO 2026 

Details about the 2026 competition are available here 

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 will see in the competition paper, you can look at these sample questions.

In addition, students are encouraged to work through old IBO past papers available here: https://www.ibo-info.org/en/info/papers.html

Students who register for the CBO competition can request the password to IBO past exams that require one by emailing admin@canadianbiologyolympiad.ca

Suggested labs - under construction

Common Techniques (updated)

Lab 1 - Coming soon 

Lab 2 - Coming soon 

Lab 3 - Coming soon 

Congratulations to all the students who wrote the 2025 CBO exam. It was a challenging exam and you should be proud of your efforts.

The 2025 CBO team members were

April	Cao	Western Canada High School
Emma	Chen	Marc Garneau Collegiate Institute
Alice	Hu	Branksome Hall
Harsh	Mutupuri	Merivale High School

The full list of gold, silver and bronze levels is available here. We are using the same classification system as the IBO; the top 10% of students are at the gold level, the next 20% are at the silver level, and the next 30% are at the bronze level. Students below the bronze level are not listed. Students are listed in alphabetical order within each category. Raw scores are not released.