On the site there are Ten Topic Areas. Under each Topic Area (i.e. Content Area) there are sub-topics.
Click on the topic and sub- topic you want to study. Then click on the level (i.e. Level 01, 02 or 03) you want to study at. Then click on the quiz you are interested in and complete the ten questions. The computer marks your answers and gives you a score out of ten (e.g. 8/10). All the best. Happy studying!