Some teachers say learning is suffering as they and their pupils near the end of an unusually long first half to their school year.
School terms were reorganised around the dates for the Rugby World Cup, with two more weeks of teaching in the first half of the year.
The change means schools do not begin their winter holiday until Friday 15 July, but some teachers and principals doubt much quality learning will happen, because students are tired.
Post Primary Teachers' Association official Julia Davidson says schools are worried about the the fourth term.
"I think that's the biggest concern, we'll have kids back at school for two weeks and then they'll go to NCEA exams."
The fourth term will be two weeks shorter than normal and primary and secondary teachers say they will have to squeeze a lot into that time.