The Government of Australia operates overseas student program that enables students from around the globe to pursue further education in the country. For this, you need to have a valid student visa depending on the nature of the course and the duration of the same that you are planning to pursue. Student visas are categorized under ten heads and for students who are below eighteen, have a visa provision, where guardians can stay in the country with the student.
However, it is important to remember that you will be granted a student visa, only if you pursue a course that is registered with the government, or is a part of such program and it should be full time in nature. International students have to go through Assessment levels which are based on the country they belong to. If you are opting for streamlined visa processing, then you can avoid the assessment level.