The Confuser books contain about 4 times more questions than the actual exam paper (100 v. 25, IIRC). If you work through the whole book (which will take you a good few days) and get say 90% of them right, there is just no way you can fail to understand the subject. Especially the incredibly tedious illustrations of the stupid circular slide rule that go on for page after page.
It is somewhat easier to cheat on the FAA exams because the entire question bank is in the public domain (legitimately) but the same principle applies - you never know which subset (of a pretty big set) you will get. But then the examiner will grind you into the ground on the oral anyway.....
Getting airborne via the FAA route may be controversial but then we are talking technicalities here anyway, which bear little or no relation to any actual in-flight requirements. The CAA may as well insist that your ba11s hang within 0.25" of each other
