In the recently concluded 2026 season, students achieved outstanding results. A total of 81 students won Gold Awards in the British Biology Olympiad (BBO), while 10 students successfully advanced to the USABO Semifinal Round, ranking among the top 10% globally.
Based on past university admission outcomes, many students who successfully received offers from top universities had USABO and BBO awards on their academic profiles. Countless high-achieving students have proven through their own experience that with a scientific preparation plan, students can effectively prepare for both USABO and BBO at the same time.
Now, the 2027 new season has officially begun. Whether you are a beginner just starting biology competitions or an experienced competitor aiming for higher awards, it is time to clarify your preparation path and set your goals.
Why USABO and BBO Are Must-Try Competitions for Biology Students
USABO: The USA Biology Olympiad — An Academic Passport to Top Universities
The USA Biology Olympiad, also known as USABO, is hosted by the Center for Excellence in Education (CEE). It is one of the most academically rigorous and influential biology competitions in the United States. In China, it is administered through BioOlympiad Initiative USA-China (BIOUS), run by ASDAN.
The exam covers knowledge from AP Biology and college-level General Biology. It is highly specialized and challenging, consisting of 50 multiple-choice questions in 50 minutes, conducted entirely in English.
Value and Highlights of USABO
Every year, approximately 10,000 outstanding students participate in USABO globally. High-performing students are highly valued by top universities such as Harvard, MIT, and Stanford.
Gold Award winners are often highly competitive in top university applications. Starting from the 2025 season, USABO added two major testing areas — neurobiology and bioinformatics — making the competition even more closely connected to cutting-edge scientific research.
For China region participants, award tiers are percentile-based: Top Gold (top 5%), Gold (top 15%), Silver (top 30%), and Bronze (top 45%). The 2026 China Gold cutoff was approximately 40 out of 50.
BBO: The British Biology Olympiad — A Strong Academic Credential for UK Applications
The British Biology Olympiad, also known as BBO, is hosted by the Royal Society of Biology (RSB). It is the oldest and most influential biology competition for secondary school students in the United Kingdom.
The exam is based on A-Level Biology and includes diverse question types. Compared with USABO, BBO has a relatively higher award rate overall.
Value and Highlights of BBO
In the University of Cambridge’s official recommended academic activities list, BBO is clearly recommended for applicants to Natural Sciences with a focus on Biology.
The award rate is around 60%, making it relatively beginner-friendly and suitable as an entry-level biology competition. BBO questions emphasize graph analysis, data interpretation, and critical thinking — skills highly aligned with the research competencies required at university level.
USABO and BBO: Choose One or Prepare for Both?
After understanding the high academic value and university recognition of USABO and BBO, many students face an important question: should I choose one competition, or should I prepare for both?
The two competitions have a high degree of overlap in knowledge, but they differ in difficulty, question style, and application relevance. Choosing the right path can greatly improve preparation efficiency.
Key Differences Between USABO and BBO
| Dimension | USABO (USA Biology Olympiad) | BBO (British Biology Olympiad) |
|---|---|---|
| Organizer | Center for Excellence in Education (CEE); China region via BIOUS/ASDAN | Royal Society of Biology (RSB) |
| Suitable Students | High school students of any grade | High school students of any grade |
| Exam Language | English only | Bilingual: Chinese and English |
| Exam Duration | 50 minutes | 90 minutes |
| Question Format | 50 multiple-choice questions | Approximately 90 multiple-choice and short-answer questions |
| Difficulty Level | Very high; college-level knowledge required | High; broad coverage based on A-Level Biology |
| Focus Areas | Knowledge depth, logical reasoning, quick decision-making | Knowledge breadth, graph analysis, experimental data interpretation |
| Expected 2027 Season Date | Early April 2027 (China-region date TBD) | Mid-January 2027 |
| China Region Award Tiers | Top Gold (top 5%), Gold (top 15%), Silver (top 30%), Bronze (top 45%) | Gold, Silver, Bronze, Highly Commended, Commended — approximately top 5%, 15%, 30%, 45%, 60% |
Starting from 2026, the BBO China exam date was moved forward to mid-January, while USABO remains in early April. This creates a natural and valuable time gap between the two competitions, making combined preparation more practical.
Key Similarity: 70%–90% Knowledge Overlap
Although USABO and BBO have different styles, their core biology knowledge is highly aligned. This is the fundamental reason why preparing for both competitions at the same time is a highly effective strategy.
Both competitions share core biology modules, including cell biology, genetics and evolution, animal and plant physiology, ecology, and biological systematics. The knowledge overlap between the two competitions can reach 70%–90%, meaning that systematic preparation for either competition directly supports preparation for the other.
Both competitions can be prepared using classic textbooks such as Campbell Biology, which provides a strong and unified knowledge framework.
Both Competitions Emphasize Advanced Scientific Thinking
Neither competition simply tests memorization. Both place strong emphasis on experimental design and analysis, graph and data interpretation, and the ability to apply biological principles to unfamiliar scenarios.
Whether it is experimental design questions in BBO or data analysis questions in USABO, students are expected to demonstrate scientific inquiry, critical thinking, and problem-solving skills.
Different Competition Dates Create a Strategic Advantage
With BBO in mid-January and USABO in early April, students have a practical path: take BBO first to gain award experience and confidence, then use the following three months to focus on USABO. This progressive strategy allows students to secure a strong result first, then aim higher.
Preparation Advice
Preparing for both competitions at the same time is completely feasible. The two competitions share 70%–90% of their knowledge content, and their exam dates are staggered — BBO in January and USABO in April — creating an ideal preparation sequence.
Competition selection should depend on students’ application goals and academic foundation. Students mainly applying to UK universities may prioritize BBO, while those mainly applying to US universities may prioritize USABO. Students applying to both the US and the UK are strongly encouraged to prepare for both competitions.
Students with an intermediate biology foundation may start with BBO, while students with a stronger foundation can aim to prepare for both competitions simultaneously.
Textbooks provide the foundation; past papers provide the most practical training. Campbell Biology is the shared knowledge base for both competitions. For BBO, practice recent past papers to improve coverage and speed. For USABO, focus on past papers from the last five years to strengthen depth, logic, and advanced reasoning.
In short, preparing for USABO and BBO together does not necessarily double the workload. By taking advantage of the overlap and complementarity between the two competitions, students can achieve a result greater than the sum of its parts.