Secondary education is the stage of education following primary school. Secondary education is generally the final stage of compulsory education. However, secondary education in some countries includes a period of compulsory and a period of non-compulsory education.
The next stage of education is usually college or university. Secondary education is characterized by transition from the typically compulsory, comprehensive primary education for minors to the optional, selective tertiary, "post-secondary", or "higher" education (e.g., university, vocational school) for adults. Depending on the system, schools for this period or a part of it may be called secondary schools, high schools, gymnasia, lyceums, middle schools, colleges, vocational schools and preparatory schools, and the exact meaning of any of these varies between the systems.
School is compulsory in Australia between the ages of five/six-fifteen/sixteen or seventeen, depending on the state, with, in recent years, over three-quarters of students staying on until their thirteenth year in school. Government schools educate about two-thirds of Australian students, with the other third in independent schools, a proportion which is rising in many parts of Australia. Government schools are free although most schools charge what are known as "voluntary" contributions, while independent schools, both religious and secular, charge fees.
Regardless of whether a school is government or independent, they are required to adhere to the same curriculum frameworks. Most school students, be they in government or independent school, usually wear uniforms, although there are varying expectations. Each State and Territories has its own format of Year 12 Matriculation: