Can individuals apply for an Australian visa by themselves?

Individuals can apply for an Australian visa by themselves. The Australian Immigration Service is unlikely to approve applications for matriculation, preparatory courses or other non-academic courses in Australia.

Generally, domestic students don't just apply for this kind of visa alone, but usually submit it together with the bachelor's degree course after the preparatory course and apply for the 573 visa directly.

The extended information was first introduced by the Australian Immigration Bureau in 1996. This is to facilitate the entry of foreigners. The tracking system for boarding planes flying to Australia was originally developed to improve the efficiency of visa examination for tourists/business people entering Australia.

In the future, countries including the United States and Sri Lanka will also adopt e-visa as visa-free treatment for foreign tourists/business people.

Baidu Encyclopedia-Australia Visa