Parata says students doing better, but only seven of 16 areas had improvements in writing.
The number of young school children achieving or bettering the national standard in reading and writing has fallen in many regions.
Education Minister Hekia Parata has released the latest achievement information, which she says shows students are doing better across the education system.
At primary and intermediate schools, 78 per cent of students met or bettered the standard in reading last year (up 0.4 per cent from 2012), 75 per cent in maths (up 1 per cent) and 71 per cent in writing (up 0.4 per cent).
In releasing the information, Ms Parata's office provided a spreadsheet which showed increases were seen in 15 of 16 areas from 2011 to 2013. However, when compared annually, the improvements are not so clear-cut. In writing, only seven of the 16 council areas had improvements since 2012.