To obtain a student visa, you have to prove that you have enough money to pay for living expenses, tuition fee and travel expenses during for your entire stay in New Zealand.
Apart from the above, university student also need to provide:
Admission Letter from university
Health and Medical Requirement
The immigration authority of New Zealand requires student who wish to stay for more than 6 months to do a Tuberculosis test and provide personal health record. The authority also requires students to purchase appropriate insurance.
Primary and Secondary School
Valid Travel Document and photos
Offer letter from education provider (must indicate that accommodation has been well arranged(for student under 18)