My $0.02...
I would suggest that they DRIVE at one or two AX'es before taking the PDS. I started with the PDS, and a lot of the material went right over my head. After about 4 AX'es, I went back and took the PDS and it all made sense. There were so many new terms in the PDS that I had never heard before. Understeer, oversteer, weight transfer, load/unload, turn in, apex, late apex, early apex, double apex, type 1/2/3 turns, decreasing radius, camber, slip angle, drift, counter-steer, threshold braking, heel-toe shifting, shuffle steer, ...
When I have a student that seems to be thinking they will drive FAST at one of their first events, I tell them that I was at the back of the class for the first year that I drove, and it took three years before I got a class win (true!). (I went back and checked, and also found out that somehow I am now the driver with the highest attendance overall?

). Of course, then you do get the student like Hassan Zaidi, who proceeded to start trouncing all of us by about his 5th-6th AX.
I agree with Mark - my biggest concern was knowing what to do the day of the AX. Even reading the very good article that was provided, there are all the things we do automatically in prepping, going through tech, parking, unpacking, etc., that are confusing and can be overwhelming for a first-timer.
After the last PDS, I had a couple of students at AX'es who were trying to force themselves to shuffle steer, which was distracting them from driving. While I am a 100% proponent of shuffle steering (and do it everywhere, even in tight grocery store parking lots), I think at first novice students should focus on smoothness (steering and throttle) and "the line", and then bring in shuffle steering after they are reasonably comfortable with those aspects.
When you get this done, perhaps you could post it on the FAQ section of the Forum?