As said, you really do have to know the material and be an ace on the wizz wheel - if you cant recognise what the question wants and do it first time on the wheel you may struggle with time as I had loads of wizz questions. On the other hand only had one question on convergency/conversion which is what I got wrong I think.
Use the feedback to categorize the types of question you may get and not the actual questions. If you can understand each category then any question they ask wont be a problem. Good luck its not that bad!