From a PSM standpoint there are no more quiz type exams. You may gain some more knowledge with the PSD open that may further your knowledge base. All you can do is study the reference material, its a comprehensive list to study. https://www.scrum.org/Courses/Professional-Scrum-Master/PSM-Subject-Are… If you feel that after browsing the material you understand the mechanics, then would say you are prepared. Should there be an element of doubt then study and re study before sitting it. Good luck.