The Principal of Avonside Girls' High School in Christchurch says the ongoing earthquakes will have a huge effect on NCEA results this year.
The school is having to share the site of Burnside High School because of quake damage to its buildings.
Principal Sue Hume says student education is suffering from the continuing earthquakes and pass rates will undoubtedly be affected this year.
Ms Hume told Nine to Noon that teachers are looking at adjusting the curriculum and at how they can support the students, but the reality is that the pupils are disadvantaged compared to the rest of the country.
However the New Zealand Qualifications Authority (NZQA) says the recent aftershocks shouldn't have a major effect on the grades of Christchurch students.
Deputy chief executive Bali Haque says the authority will be talking with teachers about what grade the student would have been likely to get if it weren't for the disruption of the earthquakes.
This will then be compared to the end of year result, and the higher mark will be allocated.
Mr Haque says the authority has other measures in place to ensure the circumstances of students are taken into account, and will do its best in particular for school leavers.