Batty has an excellent point that I would have made had he not. It supports Alex's call (that I think the other ground instructors would echo) that the exams themselves need to be examined.
Another point to consider is that, although it is a greater expense to the school, every school I know of offers more than the legal minimum of training. I can assure you that this is not done frivilously. That time is needed to cover the areas that need to be looked at. Some of the classroom material, ironically considering what Batty said, is about exam technique and how to cope with the way the questions are written.