For grade 8 aurals, I don't find the syllabus totally clear as to all the possibilities. What I think it means is:
First a major key will be played. The modulation will be one of:
Dominant major (I know you only have say dominant, but putting major makes it clearer)
(Confirmation that test will not be subdominant minor please?)
Then another from a minor key:
Subdominant minor (not totally sure if that could be asked)
Please could someone check and correct if necessary? Thanks!
Ooh. One more quick question: Would an inversion of chord 5 ever be used to form a perfect cadence?