The International English Language Testing System (IELTS) is the most preferred English language proficiency test accepted by almost all institutions in Australia. However, globally, Australian institutions are open to accepting other proficiency tests such as Test of English as a Foreign language (TOEFL) paper-based test, Pearson Test of English Academic (PTE), Cambridge English: Advanced and Occupational English Test (OET) (do check the official website of your preferred institution for the same).