The answers are all in the thread.
The questions you will face (multiple choice) are based on the whole document. So learn it all. Sorry to be so blunt, but you might as well start as you mean to go on......When you come to finally qualify as an ATCO, you need to know your unit's Manual of Air Traffic Services back to front, left to right and upside down. And that document could easily run into hundreds of pages.
To summarise the thread: Stage 1 is all group testing, no interviews. I'd recommend looking smart (I'd hate to be the one guy there in jeans and a t-shirt when everyone else is smart). Can't remember off hand how many questions on the motivation paper.