 Practice does not make perfect. Let me illustrate this by telling you a little story about a friend that I went to school with. He lived on a farm and his dad bought him an old car and he drove around the farm every day in this car. When it came time to doing our driving test, all of the other friends that I had that were doing the test did about six weeks of practice. He had seven years of daily practice. Six weeks, 90% of them passed first time. The guy who drove for seven years practiced every day. He failed multiple, multiple times. This is because he developed bad habits and every time that he drove that car, he was making these bad habits worse. This is exactly the same with IELTS student. They have bad habits, they're doing things wrong and by doing lots and lots of practice tests, they are getting worse, not better and they're wasting their time.