What are the educational standards in New Zealand?

With an excellent education system New Zealand has a 99% literacy rate and spends over 7% of its GDP on education.
The average teacher to student ratio is excellent with primary level being an average of one teacher for every 23-29 students and one teacher to 17-23 students at secondary state schools.
There is a national curriculum and all schools, state and private, are measured against it every three years by the Government’s Education Review Office (ERO). Individual school reviews are available at ERO.
Some schools also offer Cambridge International Examinations or International Baccalaureate at senior levels.