It follows Prime Minister Christopher Luxon and Education Minister Erica Stanford's selling their new maths policy at the National Party conference over the weekend, claiming just 22 percent of Year 8 students were at the expected standard for maths.

However, Aotearoa Educators Collective on Monday raised concerns the 22 percent figure was not comparing apples with apples because it was benchmarked against a new curriculum which was not yet being taught to Year 8 children.

"The original implementation of the refreshed curriculum was to begin in 2026, with a logical expectation that, as students moved through the school years, their maths achievement would be advancing. Year 1 students starting with the refreshed curriculum in 2026 would be in year 8 in 2033," AEC spokesperson Prof Jodie Hunter said.

"We question the use of data based on assessments where student tasks are based on a curriculum that is not being taught.

"The result of around only one in five students working at the appropriate curriculum level in Year 8 seems questionable given it contradicts previous national and international studies, including NMSSA, TIMMS, and PISA, which all show higher levels of student achievement."