Labour has come out swinging on the morning of the Prime Minister's State of the Nation address, saying John Key has failed to deliver on education "promises" made two years ago.
The party's education spokesman Chris Hipkins quoted figures showing the Government's flagship education policy, Investing in Educational Success, was well behind schedule.
"This funding has been sitting in the Government's coffers when it could have been going to helping our children's learning and relieving the growing funding pressures on schools," he said.
He said the "failure" of the Investing in Educational Success initiative was one of the factors that contributed to last year's Government surplus.
The $359 million policy, introduced in 2014, aims to create "communities of learning" throughout the country, encouraging schools to work together and share expertise. It also contains funding for new teaching and leadership roles, inquiry time, research and principal recruitment.