you might need to provide an evidence of your English language skills when you apply for this visa. Generally the evidence is an English language test result. e.g. IELTS, PTE, TOEFL etc.
if you are appearing for an English language test, you must score a minimum of 5.5 in IELTS (or equivalent) to apply for this visa. However, educational institutions might place a higher requirement in place for entry to a course.