Lol Secrets is not outdated. Abubaker literally came out with a new edition a year or two ago. I like Lam/Laskin's book Oral and Maxillofacial Surgery Review: A Study Guide. As an intern you'll be managing/consulted for a lot of dental trauma so learn the algorithm like the back of your hand. Learn the absolute indications for taking certain fractures (e.g. condylar fractures) to the OR. You can easily find this material in Peterson's. Peterson's is also considered the "Go To" book for all things core OMFS and board preparation. Know the principles of ORIF. AO and Peterson's do a good job of explaining this. Before walking into a case, at least know the anatomy, then the steps (Use Kademani/Tiwana's book), then the specific vital structures encountered during each step, and finally the complications. Read Ellis's Surgical Approaches. You'll read it many times during residency. Always approach any case you're consulted for as if you're the one who's managing it and think it through as if you didn't have a chief or attending to guide you. Pretend it's your patient. There's a saying in anesthesia where an anesthesia provider should always be trained and prepared for the next deeper stage of anesthesia. In surgery, you should know to how manage at least the first level of complications. Learn the deep spaces of the head and neck and how to identify them on a CT scan. Learn how to hand-tie (both one-handed and two-handed).
