Visa for Australia
Visit the Australian government website
A holiday or work & holiday visa allows you to study here for 3, respectively 4 months. You don't need TOFL or IELTS or proof of funds, just a good command of English and insurance. Visit the Australian government site to find the visa that suits you. Please take note of what your visa lets you do or not, eg work restrictions: https://www.homeaffairs.gov.au/busi/visas-and-migration .
It can take time for a visa to come through. Allow a minimum of 2 months.