Do yourself a favour and sign up to BGS. Get their notes sent over to you and then use the ATP website to run through the actual questions you are likely to get for the exams. Included in your fees for the BGS notes are the brush up courses which run for a few weeks prior to the exams which you would be silly not to take advantage of. If you want to see what you will be up against then go onto the BGS website and see examples of the types of questions that JAA have here:
http://www.jals.co.uk/forum/showthread.php?t=24