Tag: Bbo Prep
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USABO vs BBO: Which Biology Olympiad Should You Sit First? (2026)
USABO and BBO test most of the same biology, and the China-region BBO now sits in January — about ten weeks before the USABO China-region Open Exam in early April. That makes BBO an ideal warm-up, and one prep cycle can realistically target both. Here is how to plan it.