You'll be suprised on the day, best prepare for everything. You could take the risk and predict the specification but the safest option is to find 6 quotes for every poem and be comfortable to use them.
When we teach Yeats we expect our students to go into the exam being able to write about any of them . You should be ready to write about any three of the seven but if you don't know them all I would suggest you should . You will be expected to know every single poem that is listed for study