There is no possible way that anyone (including us) can guarantee you will pass the boards. It is a function of your study habits and knowledge base as well as the quality of the materials utilized. Just like reading Miller’s Anesthesia cover-to-cover is a poor strategy for passing the boards, so is reviewing information from 15 year old exams and concentrating on remembered questions from last year. There is an inherent rate of repeat in questions form year to year, but the vast majority of questions have not been asked before. There IS, however, a very high rate of repeating concepts and emphases. The M5 teaches concepts with the emphasis on understanding so that the information can be extrapolated to the specific question on your exam; not the emphasis on factoids and route memorization that has failed many of those who relied heavily on those types of resources.