Sagarkapoor, you need to look closely at the INZ website, where the requirements for a student visa are explained. You can start with this page
http://www.immigration.govt.nz/migra...hatisrequired/, and follow the links there.
My feeling is that it is the university who will have a lot of questions for you - whether you are now motivated and determined to follow through a course of study, as you have shown that you were not for the first course, and if you have the financial resources to support yourself. If the university are convinced it is worth offering you a place, it will help with INZ.