Adarsh Sivakumar, Leo Sharrock and Robert Thomas finished in the top one per cent in the country from 70,000 students and 800 schools competing in the 2019 Australian Geography Competition.
All interested students were tested on their geographical skills and knowledge with a range of multiple-choice questions.
Year 10's Adarsh said he was proud to be recognised in the top one per cent.
"A question might be 'identify patterns within these countries that have high a percentage of people with malnutrition','' he said.
"Some questions were harder than others but overall it was relatively difficult.
"I feel accomplished and a bit prideful that I've done it," Adarsh said.
GVGS entered 220 students in the 2019 Australian Geography Competition in May with 15 students receiving distinctions and 16 receiving high distinctions.
The school's head of humanities Dr Darius von Güttner said it was a great achievement by the school, and a credit to the geography teachers.
"I'm proud of the students' achievements, and credit to their ability to work with material they haven't seen before — because we don't teach for this competition.''
He said geography and humanities were often underrated as subjects.
"Everyone forgets that humanities offer a platform to critical thinking skills that are required by all industries and employers but more importantly for being a citizen," Dr von Güttner said.