How can I prove I have functional English?

To prove that you have functional English you must provide evidence of one of the following:

an International English Language Testing System (IELTS) test result with an average band score of at least 4.5 for the four test components (speaking, reading, listening and writing). Your test must have been completed within 12 months of visa application lodgement or can be completed during visa application processing
a positive assessment by an Adult Migrant English Program service provider in Australia that you have functional English
completed all years of primary education and at least three years of secondary education in an educational institution in or outside Australia and all instructions were in English
completed at least five years of secondary education in an institution in or outside Australia and all instructions were in English
completed at least one year of full-time study or equivalent part-time study towards a degree, higher degree, diploma, or associate diploma in an institution in Australia and all instructions were in English
completed a degree, a higher degree, a diploma or a trade certificate that required at least two years of full-time study or training in an institution in or outside Australia and all instructions were in English
the functional level of the Australian Assessment of Communicative English Skills test certified by the relevant testing body. Your test must have been completed within 12 months of visa application lodgement or can be completed during visa application processing.