My teacher also said that if they were to do that, they would have to
supply the poems for you, (as most people would pick and choose their own poems, and they won't know anything about the others
as much as their 'focus' poems).
But yes, have a general understanding of every poem and all the texts in the Stimulus Booklet, because you would have gone through the Booklet itself and did a couple of analytical exercises on it, I would assume.
I don't think they'll specify which Stimulus Booklet texts to use, because some don't apply for particular Focuses.
For example:
Changing Perspective: Texts 2a/2b, and Sky High.
Changing Self and Changing Worlds would have other texts from the Stimulus Booklet which they could better use (or I could be completely wrong and Sky High/Texts 2a/2b are perfectly good for every Focus
)