Christa,
I believe that most people on this thread will tell you exactly the same thing that I am about to:
Learn the whole pre-reading document for stage 1 - including all the aircraft. Even if you don't get asked about certain aircraft at this stage, it is very good practice should you get through to Stage two and eventually (fingers crossed) the college.
...and it is hardly fair play if you know the answers before you start now, is it?
Best of luck with the learning and stage 1 though - learn that document!