Where can I find the USABO 2024 paper and answers?

The official USABO 2024 paper and answer key are published by CEE — use the official archive link on this page. We do not re-host copyrighted papers, but our mentors walk through every question with you step by step.

How hard was the USABO 2024 paper?

Like every year, the first section is speed-and-accuracy work and the final third carries the discrimination. Sit it timed (Open Exam: 50 minutes · Semifinal: 2 hours), mark it against the official key, then rewrite full solutions for anything you missed or guessed.

Can I get worked solutions for USABO 2024?

Yes. Book a free trial session and bring the questions you are stuck on — a mentor will work through the full solution and the faster competition method, then set targeted practice on the same archetype.

USABO 2024 Past Paper & Solutions

USA Biology Olympiad 2024 — Open Exam: multiple-choice and true/false · Semifinal: multiple-choice and free response, Open Exam: 50 minutes · Semifinal: 2 hours. Scoring: Open Exam selects semifinalists; semifinal selects the national finalists.

Papers in this sitting

USABO 2024 Open — Open Exam: multiple-choice and true/false · Semifinal: multiple-choice and free response, official answer key included
USABO 2024 Semifinal — Open Exam: multiple-choice and true/false · Semifinal: multiple-choice and free response, official answer key included

Open the official archive

How to work through this paper

Sit the full paper timed at Open Exam: 50 minutes · Semifinal: 2 hours, no calculator or notes.
Mark it against the official key before you look at any solution.
Rewrite complete solutions for every question you missed or guessed — writing it out is what moves the technique into recall.
Tag each loss by topic (Cell & molecular biology, Genetics & evolution, Anatomy & physiology, Plant biology, Ecology & ethology).
Re-sit the same paper one week later and compare the time to your first attempt.

Topics tested in USABO 2024

Cell & molecular biologyGenetics & evolutionAnatomy & physiologyPlant biologyEcology & ethology

Stuck on a USABO 2024 question?

Send us the question number. A mentor who has sat and medalled in USABO will reply with a step-by-step walkthrough and the faster competition method.

Free to ask. No spam, ever — we only reply about your question.

View the USABO course

FAQs

Where can I find the USABO 2024 paper and answers?: The official USABO 2024 paper and answer key are published by CEE — use the official archive link on this page. We do not re-host copyrighted papers, but our mentors walk through every question with you step by step.
How hard was the USABO 2024 paper?: Like every year, the first section is speed-and-accuracy work and the final third carries the discrimination. Sit it timed (Open Exam: 50 minutes · Semifinal: 2 hours), mark it against the official key, then rewrite full solutions for anything you missed or guessed.
Can I get worked solutions for USABO 2024?: Yes. Book a free trial session and bring the questions you are stuck on — a mentor will work through the full solution and the faster competition method, then set targeted practice on the same archetype.