The Education Review Office is questioning whether a $73 million service for New Zealand's most needy children is value for money.
In a new report, the watchdog says a widespread lack of accountability for some of those funds is of concern.
The Resource Teacher Learning and Behaviour service is made up of 780 itinerant teachers who help schools work with children and teenagers who have learning and behavioural problems.
The service is managed by schools which operate in groups, or clusters.
The report raises concerns about access to the service and a lack of monitoring and accountability in all the clusters.
It has recommended a government review to determine whether running the service through groups of schools is the best approach.