I am afraid that there are several questions on both of these topics (the test selects questions at random from a large bank of questions) and so I do not know which ones you are referring to.
As the instruction page immediately before the test explains, if you do have a problem with any of them then you should copy and paste the question here, so that I can explain.
(I do obviously assume that you have already watched the free lectures on both topics 🙂 )