A handful of schools are holding out on releasing National Standards to the Minister of Education as the first round of data is made public.
Education Minister Hekia Parata said about 188 schools had not yet provided the date required under National Standards.
While the majority of those were still putting the data together, she said about 25 were "having difficulty complying" - indicating the schools were withholding it in an apparent boycott.
Ms Parata said there were sanctions to try to force those schools to hand over their results, but dealing with those schools was an operation matter for the Ministry of Education.
"Here's the thing - schools are Crown entities, they are not secret societies. They are public institutions, funded by public money to do the public job of raising achievement. This information is therefore public information."