Science teacher Bryan Rodrigues said both international competitions tested critical thinking, problem-solving skills and science knowledge.
Year 9 student David Brooke achieved a distinction in the Big Science Competition, while six other students gained credits.
In the Australian National Chemistry Quiz, the school got one high distinction, seven distinctions and one credit.
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READ NOWMurtaza Mohammadi ranked in the top 10 per cent of the state for Year 9 students.