According to myOffer, I know that I can apply for graduate students in Britain or Australia with IELTS score of 6, but it will be more difficult to apply for a good school. Generally, it is a university with a lower ranking, and only some majors can accept this score.

The IELTS requirements of famous British universities and G8 universities in Australia are generally above 6.5, while those of Oxford University, Cambridge University and London School of Economics and Political Science are above 7.0. But at the same time, IELTS 6 is also the minimum requirement given by some schools, such as Birmingham University, Warwick University, Queen's University, Leicester University, university of dundee University and Surrey University. The minimum requirement is 6.0, but depending on the major, IELTS 6.0 may not be accepted. Students who don't have enough IELTS scores can choose to enroll in language courses if they want to go to a prestigious school for postgraduate study. Generally, if you are short of 0.5 points, you only need to take 6- 10 weeks of language classes. After finishing the language class and meeting the requirements, you can be promoted to regular classes.