A big part of the HVAC exam is psychometrics and the vapor compression cycle. If you think you could master those, with your plumbing and light HVAC experience you might find the HVAC to be better suited for you.
I couldn't wait and called as well. I called the main number on the website and listened to about 3 or so menus to connect to the right department. But it was worth it because they told me I passed!!!!!