Just learn everything they say in the paper. Pretty much all of it was used. The aircraft data only formed part of 1 or 2 questions in the paper I was tested on. If you have no experience what so ever in aviation you'll probably find it hard. If you have been working with aircraft and airlines or have a PPL you could probably pass it without needing to read the document. It's going to need to be learnt off by heart sooner or later so just get it done now!
There were around 62 at the afternoon assessment! Didn't think there would be that many people willing to take assessment on Friday 13th! Will let you know how I did (not getting my hopes up!)