There's concerns some enrolment requirements could be preventing children from accessing their local school.

Last month, the Ministry of Education had to intervene after an Auckland school told a woman who lived within zone that she couldn't enrol her child without a 12-month tenancy agreement.

Auckland Grammar headmaster Tim O'Connor says a short-term tenancy agreement is worth monitoring- to ensure nobody cheats the system.

"The problem is- we have so many people making choices about the school that they want to go to that's not their local school. In our instance for example, we had 752 out-of-school enrolments in form 3 this year."

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