Barely any guidance. You do have a few assigned PBL readings for introductory chapters, but most of your readings are picked by your group. If your group didn't assign a chapter every other group did, you will get a nasty-gram from one of the professors telling you to assign it lol. Some groups will assign more or less chapters than others. Most groups assign chapters by majority (so if at least 5/8 group members votes yes for a chapter, it will be assigned for the exam). If you are in a group that is very reluctant to assign chapters, you will need to put in extra work to cover everything you need to know for boards.