For international students who plan to pursue biology competitions, preparing early for the BBO is a highly worthwhile academic investment. If you want to win an award in the BBO, you need to understand the main challenges of the competition and build the right preparation strategy. This guide will help you quickly understand the key points of BBO preparation.
Part 1. BBO Exam Schedule and Rules
The BBO is a highly regarded international biology competition that is recognized by the University of Cambridge and valued by students applying for Biology, Biomedicine, Biochemistry, and related majors.
The competition is open to high school students in Grades 9 to 12 worldwide.
Based on previous years, the timeline is usually as follows:
Registration deadline: early January each year
Exam date: mid-January each year
The exam may be taken online or offline through school-based test centers. It is a 90-minute individual written exam and is typically offered in both English and Chinese.
Part 2. BBO Difficulty Analysis
1. Broad knowledge coverage with many advanced topics
The BBO tests a very wide range of biological knowledge. Topics include cell biology, animal anatomy and physiology, plant anatomy and physiology, animal behaviour, ecology, systematics, genetics, and evolution. Many of these topics go beyond the standard high school syllabus and extend into first-year university biology. Mastering these advanced topics requires substantial time and effort.
2. Large question volume and strong time pressure
The BBO exam lasts only 90 minutes, but the number of questions is not fixed. In recent years, the paper has been especially long, which means that students aiming for top awards must compete not only on accuracy but also on speed.
Question volume and total score in recent years:
| Year | Number of Questions | Total Score |
|---|---|---|
| 2026 | About 296 questions (true/false, single choice, multiple choice, sequencing, matching, and graph/data analysis) | 316 |
| 2025 | 119 questions | 190 |
| 2024 | 169 questions | 192 |
| 2023 | 167 questions | 184 |
| 2022 | 135 questions | 186 |
The 2026 paper set a new five-year high in both question volume and total score.
3. Flexible and application-based questions
Unlike school exams that often follow fixed knowledge points and predictable formats, BBO questions are much more flexible. The paper may include image-based questions, graph and data analysis, and experimental questions. A single question may combine several biological concepts at once. Students therefore need flexible biological thinking and solid logical reasoning skills.
Part 3. BBO Preparation Strategies for Students Aiming for Awards
1. Build a strong foundation in biology
Students are advised to study Campbell Biology and use the BBO syllabus to organize knowledge chapter by chapter. Make sure you understand the core concepts in areas such as cell biology, genetics, and ecology. A solid foundation is essential, and there should be no major gaps in basic biological knowledge.
2. Strengthen biological vocabulary
Although the BBO paper is bilingual, English terminology is often more precise in biology. Students should therefore pay special attention to biological vocabulary, including technical terms and common academic expressions, and build familiarity with them through repeated review.
3. Master past papers thoroughly
It is highly recommended to study BBO past papers from the last five years in depth. Students should identify the most frequently tested topics, understand common question patterns, and summarize effective problem-solving approaches. Topic-based practice is also useful for checking which sections are weak and need more focused review.
4. Expand beyond the school syllabus
Some BBO content goes beyond what is normally taught in high school and overlaps with introductory university biology. Students aiming for top awards, especially Gold or above, should extend their reading beyond the standard curriculum and broaden their knowledge base in order to handle unfamiliar question types more confidently.
