If the exams are like what they were in my day (old CAA ones) there was only a finite bank of questions that they could ask you. So if you've been through the syllabus a few times and still no joy then practice papers lots of them! That way when the questions come up again you'll know the answer. For a source of practice papers may I suggest some of the bigger schools (that ask their students to brief the instructors on what they were asked after the exam) they have a considerable bank.
Good luck