I am in the process of choosing between the Mechanical HVAC and FP exam. I am looking for any input everyone has on the FP exam and HVAC exam. I work with automatic FP systems but I am lacking on the fire dynamics, special, egress portions which I believe is a major portion of the exam, and I cant find much for study material/tests. Does anyone have examples of good books to study and have somewhere I can get pretests? or is it mostly knowing NFPA sections. What types of calculations are there on the FP exam? Any advice everyone can give would really help me make my decision.