In a letter sent to the education minister last month, Murrumbidgee Regional High School teachers demanded Sarah Mitchell address the "issues plaguing the school", including serious worker shortages.

There is currently eight vacancies at the school and teachers say classes are regularly being collapsed or provided with minimal supervision.

The state's education department is currently "carefully considering" the letter, but in correspondence with The Area News, the department said MRHS has "a greater staffing allocation than any school of its size in NSW", with 126 full time positions rather than the usual 96.

The school has been allocated these extra positions, as well as an additional six full time staff, to assist with the 2019 school merging, the department says.

NSW Teachers Federation western organiser Brett Bertalli said highlighting the school's higher allocation is "nonsense" and simply an attempt to confuse people unfamiliar with how schools work.

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He said it is unfair to compare the allocation of a school operating across two separate sites with normal schools that are the same size.

"In other schools teachers can walk across the corridor and talk to each other. But the MRHS sites are more than three kilometres apart and the school clearly requires additional staffing to make both campuses work and to make sure the kids at each site aren't disadvantaged," Mr Bertalli said.

"The education minister is capitalising on the fact that the public won't really understand that a school with two sites requires more teachers than a normal school ... it's disingenuous."

Mr Bertalli said he is getting reports of up to 36 lessons a day not being taught at MRHS, and it was very likely teachers would strike if nothing changed in the near future.

"The staffing crisis at MRHS is impacting negatively on the education of Griffith children," Mr Bertalli said.

"The education minister Sarah Mitchell has got to realise this and act now otherwise industrial action is inevitable."

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