Although the study references on the market are good, and the syllabus is reasonable; the examination is dificult because of the poor English expression, double meanings and trick questions. (More than one right answer, just one is more correct than the other, etc.....).
I have had recent experience training some overseas students with excellent English and a sound knowledge of the subject; however, the confusing questions (English expression) slows them down to a point where they cannot make the 70% pass mark.
So best of luck........don't panic if you miss the first exam - just 3.5 hours wasted. Most get it on the second run at the goal posts.