A teacher at a Tauranga college gave his students the answers to internal assessments, forcing the school to withdraw the NCEA results of 17 students.
The New Zealand Qualifications Authority found students studying level two and level three Maori at Otumoetai College had been given the answers to internal assessments by their teacher last year, Official Information Act (OIA) documents obtained by Radio New Zealand showed.
As a result of the investigation, 17 students lost their credits for Maori standards and five missed out on level three NCEA.
Otumoetai College principal Dave Randell said it came as quite a shock to the school.
"We got an outstanding report on what we do and we have very few of our credits challenged, so to have virtually a whole subject challenged was quite a shock,'' he told RNZ.