Apex Visas, one of the leading immigration and visa consultants in India highlights that if one is planning to study here full time for more than three months he’ll need a student visa.
The Student visa requirements include:
• an offer of place from an educational institution approved by the New Zealand Qualifications Authority
• a written guarantee from an institution or person that suitable accommodation is available to you in New Zealand (if you're under 18 years)
• evidence of sufficient funds to live on while you are studying
• a return air ticket to your country, or evidence of sufficient funds to buy one.