My two boys did their Music GCSE's with a folk bend the best thing to do is to get a load of tunes that you can and like playing and offer them up to the Teacher for consideration. Beware you will be told it is not real music and your mark will be considerably lower becauase of this. They both persevered and both got A's, one going on to A level music but as a fiddler after he finished his A levels he did/does not pick up his fiddle at all, as the system crushed him.