From what I can remember, the only times that I used the ASHRAE books were...I think when I used the refrigerant tables in the Fundamentals book, and the heat capacity of various meats in the Refrigeration book. I never tabbed them, but I used the index anytime I found something that I didn't know real well where it was. The only book that I knew well was MERM. Even though they don't send scores out in SC, I'm farely confident that I did great on the morning section and worse in the HVAC. It could be a combination of my lack of knowledge about the ASHRAE books and the fact that 5 hours into the exam I my brain was fried. I also feel like i lucked out with the morning questions that I got and was unlucky with the depth section questions I got. Anyway, I'm a design/build engineer for a commericial HVAC construction company, so I actually deal with the HVAC topics in my career. I never looked at the depth questions in the other two areas, so I don't even know what they're like.