There is no way anybody is going to memorise the answers to thousands of questions.
Take Gen Nav, there are about 20 different styles of question, each with futher permutations of parameters and 'best fit' answers. What you have to learn is the abstract - how to solve the problem.
Take Met, there are so many possible answers from one question, that a bit of weasle wording will soon get you in trouble if you just learn by rote.
Take Flight Planning, the answers are all there, you just have to know where to look.
Instruments, hmm, possibly. But again, the weasle wording will send you the wrong way. Learning by rote is a recepie for environmental capture.
Errrm M&B, easy. Just remeber the forumla. No rote is even relevant. If you need to cheat on this then you shouldn't even be flying.
The only possible use this question bank could be is for the 'easy' subjects, HPL and COMMS. COMMS is a no brainer and HPL just requires a little bit of effort.
Personally, I think the JAA question bank is very cleverly put together. Not only are they testing your knowledge but your ability to work between the gaps, extract the relevant detail and your ability to make light work of heavy weather.
I predict that you will get what your Ground School has put togther...plus all the dross! Now you have to sift through it. In short, more work and more chance of failing.