Further agreeing with Hempy and Fuji, except less experience being rated (1 year), the more you know of your AIP the better, espeically when during a sim run or exam your instructor questions you about something and you are able to quote a reference explaining how you are doing it. Even now being rated, working at a 1-man tower I often read through the AIP during lull's, it is probably the most important document for us, along side MATS of course.
Also, once you are in field training, your OJTI will contstantly be asking you where a rule comes from or what the pilots should be doing and makes it alot easier if you are familiar with the documents.