You need at least 3 different poems you can compare easily all to each other to get a high grade as you never know which poem is the one you will be given in the exam. I’d say you need a few quotes they can be short from each poem or at least the main ones such as Charge of the Ligh Brigade and Exposure. Less quotes for poems like Tissue as they are less likely to come up and are harder to compare and analyse in depth. Hope that helps