Is it possible to resit GCSE Literature Poetry?

I did the gcse literature poetry exam but messed up badly and misread the question because i had two exams straight, they origonally clashed time so the school said come straight from that school that you have your first exam with to school as then you'll do the exam. I was so tired from the previous exam i misread the essay question. Is it possible to resit the exam, if so when would it be? Many thanks.