First thing, Joe, is DON'T PANIC.
It's too late to worry about learning stuff now, you need to just relax.
Even if you talk total rubbish for the whole aural, you'll still get some marks. So if you only talk total rubbish for the last bit (which is what I did

) you'll get more marks for the bits you managed to do properly too.
Now, these progressions. The following isn't textbook perfect, but it'll give you the basis of a half-decent guess at the answers, so you'll get some credit.
Chances are that at the end, it'll sound like the end of a piece. So a perfect cadence at the end is the best bet, which then tells you that the last two chords in the progression are V-I. So that's a couple of marks bagged already. There's an outside chance it'll be a plagal cadence instead (the "Amen" cadence from hymn tunes) so the last two chords of that are IV-I. Either way that's two of your chords at least partially sussed out.
The cadence in the middle may sound like a perfect cadence in the wrong key. So that would make it an imperfect cadence, ending on V. More often than not the chord before it will be I.
Alternatively the cadence in the middle might sound like it was about to finish then changed its mind - an interrupted cadence. So that's penultimate chord V and final chord likely to be VI or II (but again, chances are it will be VI).
Make a wild stab at whether it's root, first inversion or second inversion. And be open to the idea that the V might be a seventh chord (if it is, the examiner will probably hint that at you!)
That gives you something you can use to guess the answer. And guess
something rather than guess nothing so you get some credit for trying.
Anyway, good luck this afternoon.
Cheers
Katyjay
Cheers
Katyjay