A primary school on Auckland's North Shore is overflowing with so many students, it's had to convert the library and the hall way into classrooms. Milford School has a roll of 550 and is struggling to take any more students - even if they're in zone. It's an issue becoming more common across certain areas in Auckland, with property intensification, house prices and immigration playing a part in the rapid growth of some schools. But it's a different story in some of the more affluent areas of Auckland, where some schools are experiencing the opposite and struggling to fill their rolls. Bella Craig reports.