One or two words of caution about the Carol Buck study guides.
Whether you're purchasing on-line or in-store, be sure to get the correct edition for the year you take the exam. There can be rather noticable differences between years. Border's also orders/carries this book. However, I've found you must ultra-specific with the staff because they will seemingly order according to the title and not realize the importance of the year-edition.
Good luck to you.