If you are taking the academic IELTS exam, one of your writing tasks involves interpreting information on a table, a chart, or a graph. If you don’t have experience with this, it can be quite difficult. I recommend that you look at charts or graphs every few days, about subjects that interest you, in order to practice this writing exercise. This page has a lot of information from research, and some of it is presented in graph form. See what you learn by looking it over.