When you take the IELTS exam, you need to realize that the exam is trying to see how fluent you are in English. Fluency is not something that can be mastered in a few days or months. It is something that can take years. Don't be discouraged of how well you speak or understand English at the moment. This can all change will some effort and diligence from your side. First of all, speak in English as much as you can. I know it is easier to chat in your own language. But, isn't that a waste of time and money? After all, you have spent thousands of dollars to come to an English speaking country to learn a language. So, how about finding friends who speak other languages or just speak English? With some effort you will find that understanding the language and using words will become easier and easier.