julian_storey is right - the BFR isn't a test, it's a review. As there is a mandatory groundschool element, the way I've always handled it is to think to myself 'what am I not sure about on the groundschool side' (often that's included a review of the airspace requirements & classes, and of their chart symbology), and ASK for that in the groundschool. That way you can spend half an hour discussing it, at the end of which you will be able to answer any questions fine.
At the end of that, the instructor usually throws in a few other questions (yes, the documents ones are favourites - similarly the one on 'what documents need to be carried in the 'airplane'?') and then you go for a gentle bimble about to show that you can handle the aircraft and radio OK.
Tim