As well as doing IELTS listening tests, it's important to do as much general listening practice as you can. My advice is to listen to things that you find interesting. The Internet is the best place to look for videos, radio broadcasts, podcasts, films and TV programmes.
Here's a suggestion for people following the World Cup:
If you're a football fan, why not listen to match commentary in English on an Internet radio station like this one? If you're watching a match on TV, turn the volume down and listen to the commentary in English (warning: commentators speak quickly!).