Help Is In the Books
When you take the CPC exam you have all of your books there so you really don't need to *remember* a lot. If there are specific sections of the guidelines that you struggle with, highlight, underline, and make your own notes in the sidebars. The only thing you cannot do is tape or otherwise affix any other pages or post-its in the ICD-10 book. It is perfectly acceptable to use those blank spaces and pages for your own cheat sheets.
Hope that helps. Good luck!