I made a really big mistake in my Gcse English literature exam need help?

Well the poetry bit was where I made a mistake, it said compare 4 poems from List A and List B I compared 2 poems from list A which were pre-1914 poems and then 2 Carol Ann Duffy's poems from list B. My friend said that I did the List A bit correctly, but the mistake I made was on List B that I was suppose to compare one poem of Duffy and the other poem of Simon Armitage but this wasn't mentioned on the exam paper that you have to mention one Duffy's poem and one Armitage poem. Please someone give me some advise!!!!!!! Thank you