Can someone from Duolingo's team explain what we practice when we click on this icon? Furthermore, when we scroll down the page the icon stays at the same place and is kind of aligned with lessons. Is it an indication of the level/skills we are to practice? I think the explanation should be add to he help section. Thanks!
This test contains a mix of questions from all the skills you've already learned. The icon does behave a bit strange, depending on what browser you're using. The (incidental) alignment with certain skills is somewhat confusing at first.