For a long time PLAB 1 questions and the PLAB 2 scenarios have been becoming more unique and original.
Question banks like Plabable and the sample questions on the website are questions that are most like the exam, i.e. high quality questions.
What one learns from a high quality question depends on their starting point before doing the question.
For example, if you have a complex question about diabetes diagnosis, you don’t really know that topic, and you get the question wrong, then the only thing you know is that you need to review diabetes.
If you know the topic well and you get the question wrong, you will learn about how you might have processed the question incorrectly and other higher level skills.
In the first case, you have wasted that practice question and it cannot be used to teach you the higher level skills even after you go back and review diabetes.
Lower quality questions can be used to learn the material, and then the higher quality questions, the ones more like the real exam, can then be used for the higher level skill development.
The problem with this strategy of course is time. Spend to much time with the low quality questions and reviewing, and you won’t have time for the high quality questions. Do the high quality questions before learning the material and your skills don’t improve.