Without having a registration, bagging a job in the field of teaching in New Zealand is difficult. Signing up at Immigration Advisers New Zealand Ltd. will let it easy obtaining for NZ teacher registration. If your qualifications and skills match with the ones specified by the higher authority, then you need to follow a few steps. Else, you have to sit for a small test.
https://nzimmigration.info/work-visa/teaching-in-new-zealand/