However, year 12 students also have to sit their English exam on Tuesday morning.
QCAA acting chief executive officer Claude Jones said it became aware on Monday afternoon that the school had taught an incorrect topic.
“We are now working closely with the school’s staff to ensure that no student is disadvantaged,” he said.
“Schools are notified of the topic for the ancient history external exam more than 12 months in advance.
“The school is submitting a whole-cohort illness and misadventure application so that special consideration can be applied when student results are finalised.
“Our assessment experts will apply additional quality assurance processes when marking these exam responses.
“Students have already completed 75 per cent of their assessments in this subject.
“The QCAA is committed to ensuring every student receives fair and accurate results.”
An Education Department spokeswoman said State High identified the incorrect content had been taught on Monday.
“The school has designed a plan for the two impacted classes, which was communicated to parents and students immediately along with an updated resource pack,” she said.
Extra support will be provided by the school’s student services team on Tuesday and Wednesday.
“The department and school are deeply sorry for this mistake and are supporting students and families during this time.”
The Brisbane State High 2025 senior course guide, available online, says ancient history unit four features Julius Caesar.
In 2017, a NSW teacher was sacked after he taught the wrong maths course to HSC students for more than seven months.
Loading
The teacher had been teaching two year 12 students and five year 11 students mathematics general 1, a course that did not count towards HSC or ATAR requirements, instead of mathematics general 2 for more than seven months.
That error was discovered within two months of HSC exams in October.
Start the day with a summary of the day’s most important and interesting stories, analysis and insights. Sign up for our Morning Edition newsletter.
