sure about the rest of the country, but in California the exam is
administered by PSI.
Hadn't spotted it before, but on their home page, PSI
offers a helpful tutorial (link on the bottom right)--it's
more-or-less the same material that comes up when you first sit
down in your cubicle to take the test. Most helpfully, the
tutorial has images of what the screen on the exam actually looks
like (see below). The prep course screens don't quite match
it. So, take that little slice of unknown away, and gaze at
the California screen to come...