why not just publish the question bank like the FAA do ? It shows students what they need to know, and puts all these question banks out of business at a stroke.
The FAA no longer publishes the question bank. But there are a lot of sample tests available that come close.
The US requirement for PPL is one (1) test, 60 questions, 2.5 hours, 70% correct to pass. All electronic. Testing services charge US$ 150. The test results are good for 2 years. The checkride examiner will look at the codes for questions answered incorrectly and ask the examinee appropriate questions.