BO Papers Archive

Here you will find the growing archive of translated Biology Olympiad papers from the world, browsable by programme, year, round, and problem. Using these to prepare? See our guides for IBO, USABO, and INBO.

BiOrchive is the flagship of this archive: every IBO question is reproduced in full with the original figures, an interactive true/false quiz, and a timed-attempt mode, cross-linked to the matching topic notes elsewhere on this site. Other programmes are being added over time.

BiOrchive - International Biology Olympiad

The full IBO archive: official exams + answer keys, plus unofficial community solutions. Every question comes with an interactive quiz, figures, and a timed-attempt mode. 2019, 2022, 2023, and 2024.

Question Bank

Every question across the whole archive, in one searchable table. Filter by olympiad, year, topic, and difficulty to find practice on exactly what you need.

Indian National Biology Olympiad

INBO theory papers with interactive quizzes. MCQ, true/false, numeric, and matching questions. 2026.

New

Taiwanese Biology Olympiad

First Stage, Second Stage, and Final Stage (Theory + Practical), translated papers. 2023 sample year.

Sample

🏆 Hall of Fame - Leaderboard Complete a Timed Attempt, submit your score, and see where you rank: overall standings and per-round leaderboards. Optional and free, like everything else here. →

Have a paper to contribute, spotted a mistake, or want to share your own solution to a question? Visit the Contribute page: everything goes to a staff review queue first. You can also email papers directly to resourcerepository4boguide@gmail.com.