Big Science Competition vs Junior Science Olympiad: Which One Should Students Do?
Big Science Competition and Junior Science Olympiad both test science reasoning, but they serve different purposes. Big Science is a broad diagnostic for Years 7-10. Junior Science Olympiad, often called JSO, is a more demanding pathway for students who want deeper extension science.
For many families, Big Science is the better first step. It helps identify whether a student is ready for broader science problem solving. JSO is better when the student already enjoys challenging science questions and can connect ideas from biology, chemistry, physics, Earth science and data.
Quick Comparison
| Area | Big Science Competition | Junior Science Olympiad |
|---|---|---|
| Best fit | Broad Years 7-10 cohort | Strong science students in junior secondary |
| Main purpose | Diagnostic and enrichment | Extension science pathway |
| Question style | Science literacy and reasoning | Broader, deeper science reasoning |
| Preparation | Build topic breadth and data skills | Build integrated science and problem-solving stamina |
| Possible next step | Try broader science enrichment or JSO readiness work | Consider JSO Y9-10 or the Australian Science Olympiads pathway |
What Big Science Is Best For
Big Science is useful because it shows how well a student can apply school science to unfamiliar contexts. A student may know a topic in class but still struggle when the question mixes graphs, experimental design and real-world interpretation.
Use Big Science when you want:
- an early science benchmark;
- a low-pressure extension goal;
- evidence of strengths and gaps across science areas;
- a stepping stone toward JSO.
What JSO Is Best For
JSO suits students who are ready for a more serious science challenge. It rewards breadth, accuracy and reasoning under exam conditions.
Preparation should include:
- biology, chemistry, physics and Earth science foundations;
- interpreting experimental results;
- graph and data reasoning;
- multi-step problem solving;
- careful written and numerical explanations.
Which Should Come First?
If a student has not done many science competitions before, start with Big Science. If the student already performs strongly in science extension and enjoys challenge questions, JSO can be the main target.
A practical path is:
- Big Science for benchmark and confidence.
- JSO Y7-8 for junior extension.
- JSO Y9-10 or Australian Science Olympiads pathway when the student is ready for deeper competition science.
How To Use The Exam Guides
This comparison explains the difference between the competitions. It is not meant to replace the individual exam guides.
Use the exam-specific guides when you need practical details such as dates, eligibility, format, registration windows and preparation focus:
Free And Helpful Preparation Resources
Families do not need to begin with a paid course. A sensible first step is to understand the exam, check the student's current science confidence and use a few reliable free resources.
Here are five useful starting points:
| Resource | Best for | Notes |
|---|---|---|
| Australian Science Innovations Big Science page | Understanding the official Big Science format | Use this for official competition scope and organiser updates. |
| Australian Science Innovations JSO page and free JSO past exams | Understanding the JSO pathway and exam style | The past exams are the most useful free JSO-specific practice resource. |
| ABC Education Science | General science revision across Australian school year levels | Useful for refreshing school science concepts before harder competition questions. |
| Science by Doing or Science Connections | Curriculum-aligned science learning | Useful for experiments, topic explanations and broader science literacy. |
| AceAchievers free exam guides and cheat sheets | Parent-friendly comparison, dates and preparation planning | Use these to connect Big Science, JSO Y7-8, JSO Y9-10 and the broader science pathway. |
FAQ
Is Junior Science Olympiad harder than Big Science?
Yes. JSO is generally more demanding because it expects broader science knowledge and deeper reasoning.
Should my child do Big Science before JSO?
For many students, yes. Big Science is a useful first benchmark before committing to deeper JSO preparation.
Does Big Science help with JSO preparation?
Yes. It builds science reasoning, data interpretation and broad topic awareness. JSO still needs more focused preparation.
What should students do after choosing a competition?
Check the latest exam details, make a simple topic map and begin with short mixed science questions. The next step should match the student's current confidence, not only the most ambitious pathway.