Yes, for well over 65 of the 80 questions on my AGK exam I didn't have to give it a second thought, I'd seen the questions before and just had to click and go. Was done the 2 hr exam in 35 minutes. Some say you'd be stupid to, but if you want to pass the exams themselves with the highest possible grades, then I'd say you'd be stupid to forego the question banks. For me at least I find the questions to be somewhat unrelated or different to the material itself, they can be so specific or focus on certain areas you may never have even considered during study, to the point that if you just studied the material you may as well be rolling a dice to get the right answer in the EASA questions.