Choose Exam 1 or Exam 2 or both and then click either "Tree" or "Folded tree" for viewing the table of contents. Each leaf of either tree takes you to a page with learning topics, exam questions, contributions and comments related to those topics. Harpo uses these for you practice exams, and partly for your real exams, too. When logged in to Harpo, the "Tree" view allows you to set and see your own study status per page.