From the ACSNZ website

The Association of Cambridge Schools in New Zealand (Inc)

• Is made up of schools registered to offer the University of Cambridge International Examinations (CIE). These schools offer IGCSE and/or AS and A Level qualifications.

• ACSNZ provides a network of support for member schools and keeps them informed about developments related to Cambridge. It organises the annual Outstanding Cambridge Learner Awards Ceremony.

• ACSNZ liaises with academic bodies and institutions on university entrance and related matters. It also works closely with Cambridge and its Regional Manager.

• ACSNZ co-ordinates the development and administration of courses specially developed for New Zealand students – see NZ Based Courses page.

• ACSNZ organises a Conference, held every second year.

• ACSNZ manages the administration and registration of private candidates.

Other reading: http://hef.org.nz/2012/cambridge-exams-for-home-educators-private-candidates/