An investigation into how nine Queensland schools taught the wrong topic for a year 12 exam will now be widened to probe why a report to the education department about another school making the same error two months ago was not further investigated.

Rochedale State High School, in Brisbane's south, realised earlier this year it had been teaching year 12 ancient history students the previous year's topic on Augustus, instead of the correct subject, Julius Caesar.

The school then began teaching the correct topic ahead of Wednesday's external exam, which was worth 25 per cent of students' final marks.

In August, a parent at the school complained to the Metropolitan South region's director about the school having taught the wrong topic and its handling of the error.

Despite that warning, t

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