Do you have a take-home exam? You still have time to do something many students don’t ever consider.
Everyone knows they should collect their professor’s materials, preferably on computer so they can do a text search of key words. (For a text search, consider Google Desktop Search or Copernic Desktop Search.)
What most students don’t consider is this: Obtain secondary sources. For example, buy a study-aid, borrow a treatise or hornbook on the subject from the library, or get copies of other students’ notes. All of these may be useful during your take-home exam. The key is to consider your particular exam and what you might need in addition to your notes. Students who have taken this class before may provide some guidance to you on this.