Rhetoric includes metaphor, personification, metonymy, argot, exaggeration, duality, analogy, parallelism, rhetorical questions and so on. The form of expression is vague and has no specific definition (see the first paragraph).
In the past, when I appreciated poetry by myself, I classified lyricism and expression as forms of expression and separated rhetoric from forms of expression.
Personally, when appreciating poetry, we should first look at the title (you can know the content) and author (you can know the general style) of the poem.
Then read the poem and translate it with the help of notes. Then you can know what rhetoric or expression is used.
When answering questions, refer to the general format of poetry appreciation questions (generally expressed in the form of * *). When answering questions, you should also answer the characteristics of these techniques, which make poetry look.
Find some typical poetry appreciation topics (mainly techniques and feelings) and practice more, so you can generally cope with the college entrance examination.