secondary school age range

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There are a range of secondary schools available in New Zealand.
Home education (sometimes called homeschooling) is an option in New Zealand. Parents and caregivers who want to educate their child at home need to first get approval from their local Ministry of Education office.

The education system in South Australia consists of 3 stages:
All young people between the ages of 16 and 17 years must attend full-time schooling, training or work for at least 25 hours per week.

References:

http://parents.education.govt.nz/secondary-school/secondary-schooling-in-nz/
http://www.sa.gov.au/topics/education-and-learning/general-information/sa-education-system
http://www.gov.uk/schools-admissions/school-starting-age