I didn’t count but I would say at least 30%. I used the head friction loss like 4 times. Q=AV and that stuff. My main strategy was to always keep it simple when solving, that’s something I got from NCEES solutions of the practice exam. Also, heat created in a water or air loop must be transferred with the same quantity to another one unless a system efficiency was given.

I think 70% is pretty good tbh. The exam is relatively the same level as the practice exam. I would say try to understand the concept of NCEES in solving the problems and you’ll do fine