I am well aware that some people do just do the feed back and that they pass all the ground schoolexams. But you cannot rely on the question bank not changing as it did for the Gen nav exam a year last sept. ( I think it was that month anyway, not too sure)
I am just speaking from my own exprience and that of 2/3 of my course where we did put in a lot of work to get that extra 3 or 4 percent.
Any how the whole point of my reply was to confirm to those who choose Oxford as a training school that I was a very satisfied customer and an insight to the work ahead.
Besides I am sure you did more study than just feedback, but maybe not as much as the people passing with a high 90's average.