A wider gap between the rich and poor has contributed to New Zealand's slip in international education rankings say Tauranga principals.
The Programme for International Student Assessment (PISA) measures the performance of students in OECD countries every three years. Fifteen-year-old students from each country were assessed in 2012 on their reading, mathematics, science and problem-solving abilities and each country's performance was ranked.
New Zealand's scores slipped in each section of the PISA results and have been doing so since the early 2000s.
The improvement in Asian countries' performance had contributed to New Zealand's fall, but Education Minister Hekia Parata also identified other factors such as a major shift in the curriculum in the last three years and under-investment in teachers' skills, which the Government was addressing.
Tauranga principals spoken to by the Bay of Plenty Times said the drop could be put down to poverty and increasing pressure on schools to measure student achievement.