OFFICIAL USABO ARCHIVE
Pre-2019 Open & Semifinal Exams
2003–2018
Official archive containing past USABO Open and Semifinal examinations and available answer keys.
View Exam ArchivePRACTICE
USABO Practice Exams
Train with past exams, identify your weak areas, and get comfortable with USABO-style questions before exam day.
Official External Resources
Past USABO exams remain hosted by their respective sources. This page does not store or reproduce exam files; it simply helps you find and access them.
PAST EXAMS
Practice with real USABO questions.
Use released exams to practice under timed conditions, learn the style of USABO questions, and identify topics that need more review.
OFFICIAL USABO
USABO Student Corner
The official student resource hub for USABO materials, competition information, test-taking guidance, and available past-exam resources.
Visit Student CornerGLOBAL USABO RESOURCE
Past Papers Collection
2003–2025
A historical collection of USABO past papers and preparation resources available through the USABO China/global partner site.
Browse Past PapersSTUDY STRATEGY
Don't just take the test. Learn from it.
Simulate Real Conditions
Take an Open Exam under a strict 50-minute time limit. No notes, no textbook, and no pausing.
Target Your Mistakes
Your score is only the starting point. Review every question you missed or guessed and determine exactly why you missed it.
Return to the Biology
Connect weak areas back to the corresponding Campbell Biology chapters, Topics pages, videos, and club resources.
Build an Error Log
After each practice exam, record the questions you missed, the topic they tested, and what you need to review.
Your practice tracker · Saved on this device
Keep track of exams you complete. Open the original sources above to choose an available paper; this tracker does not provide exam files.
2026 OpenReview plan
2025 OpenReview plan
2024 OpenReview plan
2023 OpenReview plan
2022 OpenReview plan
2021 OpenReview plan
2020 OpenReview plan
2019 OpenReview plan
Found a weak spot?
Go back to Topics to review the concepts behind the questions you missed.