USABO Open Exam
The USA Biology Olympiad (USABO) Open Exam is the first round of the national biology competition, testing high school students across all major biology disciplines to select semifinalists for the International Biology Olympiad team.
50
Questions
50 min
Time Limit
50%
To Pass
Checking for saved progress...
Exam Rules
- You can skip questions and return to them later
- Flag questions for review before submitting
- No feedback shown until you submit the entire exam
- Unanswered questions count as wrong — answer everything
- 10 pretest questions are mixed in and don't affect your score
- Timer auto-submits when time runs out
- Your progress is auto-saved every 30 seconds