On the morning of the exam, a low-glycaemic-index meal, such as Vogel's toast with an egg or oat-based muesli with yoghurt and fruit, would get top marks.
"That is a good way to start the day and it keeps your blood sugars nice and even," Hart said. Keeping hydrated was also very important.
Taking a sports drink into the exam would hydrate as well as give the body extra carbohydrates.
Hart advised steering clear of "brainfoods" such as blueberries and salmon unless the body was accustomed to them.
"To have a brainy body you would eat that sort of thing all the time but because the body does not like surprises you would not introduce these around exam time."
New Zealand Qualification Authority deputy chief executive Richard Thornton said preparation and parental involvement were the keys to success. "We are getting to crunch time and students need to make sure they are well prepared," Thornton said. Exams were a big part of NCEA achievement and students could access a great deal of information and study tips to help them get ready.
Thornton said parents should have their own checklist to make sure they provided the best environment for their children to study and rest, ensuring they ate properly and were well prepared. Parents should be familiar with the exam timetable and ensure children arrived in plenty of time.