aural is supposed to be a listening test, and in truth, the singy bit is very short - in all honesty, I think you can simply put that in perspective and not bother too much about it. I did grade 7 having taken about 100g of menthol sweeties over the previous 24 hours, with a streaming head and croaking voice, and did extremely fine - my singing wouldn't have sounded all that different anyway even without the cold, hehe

. It's more important not to overtax your voice. They do say you can whistle instead, but controlling a whistle can be just as hard as controlling a voice properly...