Don't worry too much about unseen, a really good structure for it is A HIT POEM
A- About (a rough summary of what the poem is about)
H- Historical (if it is relevant to the poem mention historical context, eg.. a 2nd World War poem so early 1940's)
I- Imagery (note any vivid or descriptive language)
T- Techniques (does the poet use alliteration, similes etc..)
P- Personal response (how does the poet in the way they write make you respond ?)
O- Organisation (structure, how is the poem organised/structured and why? eg the poet uses many stanza's to represent the narrators fragmented mind)
E- Emotions (what is the tone or the mood of the poem ? )
M - Message ( what is the main message the poet is trying to convey ?)
Hope this helps ! x