Learning English teaches you how to express yourself and communicate, but don’t forget to work on the what you want to say. There were a few IELTS candidates who were very good, but couldn’t speak for even two minutes about a topic. Overconfidence is one problem that face native speakers in IELTS, but for non-native speakers,it is necessary to build critical thinking skills.
Watch this excellent 4:30 video on critical thinking skills. Points four and five are good ways to help you think of the what to say in assessments, or just in daily conversations with friends and family.