many of these may not be multiple choice questions … but they cover one or more concepts and could very well become part of a multiple choice question on the exam.
Also do not forget the other resource you have from the CFA institute - with your login - you have questions available online on your account - for each reading - do those and you will be well served.
I think the Q-bank is useful when you want to do a review for the material you just read. It helps you remember the most important concept, so this is helpful after you read each topic of the material. However, I find Q-bank a little bit easier than the actual exam as it is only related to the chapter you just read. The actual question in the exam will be a bit more tricky as it will cover a broader area and not just only a single topic. That is why we need to do the mock exam on CFA website as those exams have a lot of similarity with the actual one.