These were two subjects I found I particularly benefitted from the feedback questions BGS had at the time. I did my mod 2 exams back in September last year, and BGS had quite a load of questions particularly for POF, imerative that you go through all of them (I'm sure you would anyway).
At the time high speed flight featured quite heavily, not sure if that's still the emphasis, but the BGS brush-up should let you know, and yes, it did help me a fair amount with POF.
All the best with it.