Hi i have been working for my company for ten years now and for the past 7-8 years as a service tech/ installer. I am about to take my first nate exam next month and do not know what to expect. I was wondering if any of you have a suggestion on what books or study guides would be good to read to prepare for the core and gas heating test. My company already bought me a exam review that just consists of review questions. but would like something more then just questions to answer.