The "Settings" allows you to choose the level of difficulty and how much repetition you'd like in a particular topic. When you get a problem, you can also choose your "Focus Topic" by clicking on the pencil sign on the RHS. You can work on a particular topic, or to follow the chapters in their books, i.e., focusing on Pre-Algebra, or Algebra, etc. They will occasionally throw in review problems from areas that have been mastered. Hope this helps.