Two words of caution to anyone using or thinking of using these question databases either off e-bay or the websites you subscribe to.
(1) The answers given are frequently either wrong or disputable. This is largely due to the fact that the websites these disks are hacked from rely on students contributing questions from exams they have taken. It is quite difficult to remember the questions and the 3 answers accurately given the pressure of the exam environment.
(2) Questions I have seen on these sites have appeared in exams I have taken where I think "easy, I've seen this one" only to realise the sneaky CAA chaps have reversed the question and/or answers to mean something completely different. In this case if you do not understand the subject matter you are more stuffed than if you had never seen the question at all.
As Nutloose says it is no different to when we did the BCAR exams except we had to use fax machines, photocopiers and a considerable amount of networking in those pre internet days.