Queensland secondary principals say the State Government's axing of teacher resource positions is having a big impact on schools.
Each secondary school was previously allocated one resource teacher to reduce class sizes, increase subject choices or provide additional support to students.
Norm Fuller from the Secondary School Principals Association says the positions were particularly important for smaller schools.
"Obviously the number or range of subjects that are able to be offered in a school that size are no longer able to be offered," he said.
"It means that for some subjects such as, say, modern history, where you would have had a class in Year 11 and a class in Year 12, now those classes might need to be combined.
"So you have one group with one teacher teaching them at the same time."
Queensland Education Minister John-Paul Langbroek says the redeployment of resource teachers prevented the need for redundancies in a tough budget year.
"Core business is getting back to the frontline," he said.
"That's what we have asked all of these teachers, all of whose work we have valued in the way they were providing services.
"But this year, rather than having redundancies, we have asked teachers in different parts of the state who were doing different sorts of roles to come back to the front line."