For those who are taking HVAC exam, if you want to pass
1-get familiar with Ashrae Books. read the index and have an idea where you can find things.
2-Do as many pschrometric chart problems as you can.
3-Get familiar with Refrigeration Cycle Diagrams. Be able to read it. it will be piece of...
I have the same feelings about the actual exam. I took HVAC exam. Especially, Morning Session was very tricky and I saw unexpected questions based on their difficulties when you compare with NCEES sample exam.