The Government is yet to respond to the report, which is based on outdated figures and a year in which New Zealand did badly in the Pisa results. Pisa is the assessment system used across 65 countries to evaluate 15-year-olds every three years. The last report in 2013 showed that in 2012 New Zealand's average scores in mathematics, reading and science had declined since 2009 and students' performance had declined compared with other countries, although it was still above the OECD average. At the time, Education Minister Hekia Parata said that was partly because of changes in the education system such as a new curriculum and the need for more investment in improving teacher practice. She said the Government was working on those areas. The next report is due later this year.
Green Party co-leader Metiria Turei said the report showed the Government was not prioritising areas of education which needed it and instead focussing on issues such as charter schools.
"It is a massive indictment that under this Government kids from poorer families have less of a chance of escaping poverty through education than they did before National came to power."
Ms Turei said it was concerning Unicef had not been able to get figures from New Zealand on health or life satisfaction from the Government.
The report by Innocenti, Unicef's research arm, said that across the OECD it was vital to make steps in reducing the gaps in child well-being.
It recommended governments move to protect the incomes of the poorest households and take steps to improve educational achievement as well as putting equity at the centre of moves on child well-being.