It's important to practise doing real IELTS listening tests (use the Cambridge books for this), but that isn't the only listening practice you can do. I advise my students to watch TV, films and online videos - anything that interests you is good for your ear!
If you find a good video on the Internet, please share it with other students. For example, Shafaq shared this link to a very clear speech by an author addressing students at a graduation ceremony. It's useful because you can listen and follow the transcript at the same time.