Science Olympiad Event Practice Tests
Free study guides and AI-generated practice tests for every test-based Science Olympiad event, grouped below by division for the 2026–27 (2027) season. Each event page has a topic guide, a sample question you can try without signing in, and unlimited practice tests at Invitational through National difficulty. You can also see the full official 2027 events list for both divisions, including build events.
Offered in Both Division B and Division C (2027)
These events run in both the middle-school and high-school divisions this season.
Anatomy and Physiology
Practice tests & study guide · Invitational to National difficulty
Botany
Practice tests & study guide · Invitational to National difficulty
Circuit Lab
Practice tests & study guide · Invitational to National difficulty
Codebusters
Practice tests & study guide · Invitational to National difficulty
Disease Detectives
Practice tests & study guide · Invitational to National difficulty
Dynamic Planet
Practice tests & study guide · Invitational to National difficulty
Experimental Design
Practice tests & study guide · Invitational to National difficulty
Remote Sensing
Practice tests & study guide · Invitational to National difficulty
Rocks and Minerals
Practice tests & study guide · Invitational to National difficulty
Thermodynamics
Practice tests & study guide · Invitational to National difficulty
Water Quality
Practice tests & study guide · Invitational to National difficulty
Division B Only (2027)
Middle-school division events for the 2026–27 season.
Crime Busters
Practice tests & study guide · Invitational to National difficulty
Food Science
Practice tests & study guide · Invitational to National difficulty
Heredity
Practice tests & study guide · Invitational to National difficulty
Meteorology
Practice tests & study guide · Invitational to National difficulty
Solar System
Practice tests & study guide · Invitational to National difficulty
Write It Do It
Practice tests & study guide · Invitational to National difficulty
Division C Only (2027)
High-school division events for the 2026–27 season.
Astronomy
Practice tests & study guide · Invitational to National difficulty
Chemistry Lab
Practice tests & study guide · Invitational to National difficulty
Designer Genes
Practice tests & study guide · Invitational to National difficulty
Forensics
Practice tests & study guide · Invitational to National difficulty
Protein Modeling
Practice tests & study guide · Invitational to National difficulty
Past-Season Events (Still Great Practice)
Not on the 2027 slate, but these events ran in recent seasons and return often — their study guides and tests stay open.
Ecology
Practice tests & study guide · Invitational to National difficulty
Fermi Questions
Practice tests & study guide · Invitational to National difficulty
Fossils
Practice tests & study guide · Invitational to National difficulty
Machines
Practice tests & study guide · Invitational to National difficulty
Microbe Mission
Practice tests & study guide · Invitational to National difficulty
Optics
Practice tests & study guide · Invitational to National difficulty
Ornithology
Practice tests & study guide · Invitational to National difficulty
Reach for the Stars
Practice tests & study guide · Invitational to National difficulty
Tower
Practice tests & study guide · Invitational to National difficulty
Wind Power
Practice tests & study guide · Invitational to National difficulty