I plan to take the exam next month and I have purchased the test exam on ASHRAE. It looks like the test exam is very different from the suggested reference material such as 90.1, 55, 62 or Fundamentals. So I wonder other than the sample test, are there other material that is more relavant to the exam? I understand experience is very important but I feel the sample exam sometimes can have many seemingly correct answer if you think deeper.