I read it occasionally during the second year and found it helpful in understanding concepts. Then, I spent about a week, all day, going through the whole book before boards (I took five weeks to study overall). If you go through the book the way the authors suggest in the preface, it can be of value to you. They suggest reading the question and then seriously thinking through the science to come to an answer. Then read the answer. I got some right, and many right to a small degree, and missed lot of interesting correlations that I never learned in class. It helped me really understand the concepts behind the facts I memorized in First Aid. It takes a lot of time to do it this way, but I feel like it helped my score a lot. If you just read the book through like a novel, you won't retain much of it. I would still suggest knowing First Aid WELL before moving on to other books.