Ashley, have no fear. If you are OK with electrical terminology, and ohms law, you wont have too bad a ride. As an earlier post suggests, get the book and get familiar with its layout, part 1,2,3 and so on. The exam is structured the same as the book, so question 1 will come from the front of the book, and question 60 will be near the back. However, it is not as easy as it appears when i explain it like that. Once you get about 13 questions in, you will start to get questions on part 4, protection, this is where you start to look into charts and tables in the appendices, and in part 5 selection and erection it get even worse, almost straight away you are into appendices, looking up installation methods and so on. Over half of your questions will come from parts 4 and 5, so if you want to spend anytime at all on it, then have a glance through those 2 parts.
You dont need to revise for the exam, you will achieve nothing except getting headache. Do the course, and listen to what you are told, and listen to the comments from others doing the course with you. It is straight forward, and you will have no great problems with it. Leave the stinkers till last, and worst case scenario, guess the buggers, you can usually eliminate 2 out of the 4 answers just by common sense. the key is to read the question properly.
Cheers..........Howard