I would say that you are ready to take the exam!!!
If my own prac exam results are any guide: 63 68 65 76%
Then Real exam: 93%
I am beginning to think it is a deliberate strategy of the authors to 'toughen you up' through the study book and the prac exams, before giving you an easy ride in the real exam.
Also remember the "choose any" turns into "choose two" or "choose three" on the real exam questions and this "hint" gives you perhaps an extra 5%. It certainly helped me to deduce the answer on 3-4 questions out of the 72 that I might have otherwise had no idea.
Good luck mate. You've done the hard work... go for it.