I'm doing mine at the moment and this is how it is marked
Demand - 0-3
Interpretation- 0-9
Communication- 0-9
Accuracy- 0-9
So the whole solo is out of 30 marks.. this is why you shouldn't pick a higher grade song that you can't sing as well because the demand means the grade the song is.. and it is ONLY WORTH 3 MARKS!!! So please please please don't choose anything out of your comfort zone in an attempt to get better marks. You could sing twinkle twinkle little star and as long as you sang it perfectly and confidently you could get 28 out of 30... that's over 90%! An easy A*!!