You mean, to get to that level? (I think you need band 7 for Australia.) Well, apart from getting a tutor or teacher to assist you, just practise, practise and practise. Pay attention and keep asking questions. Talk to people (native and non-native speakers), but realise that not every native speaker is good at their own language and even good speakers will make the occasional mistake. Oh yes, also relax and have fun. :)

that's the English course/test equivalent of overseas requires level I think (for the country where don't use English for communication in life...like some of the country in Asia) if u intend to take courses or working in English overseas, u need to be fluent in English, to understand and communicate well in that language

What is this thing ... "high lelts band"?