The Ministry of Education says it is closing a class for senior pupils in Moerewa, Northland, because its NCEA achievement rates are alarmingly low.
The school is fighting a directive by the Ministry to close its unit for Year 11 to 13 pupils.
It has previously claimed its NCEA results were better than those achieved by neighbouring secondary schools.
But a detailed audit by the Qualifications Authority has shown Moerewa's pass rates range from 11% to 33%.
Regional operations spokesperson Nick Pole says the unit is not delivering quality education.
But the school's principal says the ministry did not mention that all three of Moerewa's year 13 students gained University Entrance.