Sat this exam last week, yes it is open book, powerpoint presentation, then part A which is 30 questions and part B which is 10 questions, Its all mulitple choice, But there are about 3 or 4 questions where you have to answer in a few words. Even though it is open book its not easy finding the relevent info and its worded slightly different in the book to what the question asks. Mostly its all on backflow prevention, make sure you read module 8, 4 and 2...seem there was more questions refering to those ones than anything. Its 75 minutes long, if you dont finish in time you have to resit. I only just made it with 10 mins to spare!