The average scores are there mostly to gave you an idea of whether its's a hard or an easy paper, for example. one non-verbal reasoning paper has a historical high score of 16 out of 20 so clearly all children have a bit of trouble with this section. Please note that the average and high scores do not factor in the time of year so do not be alarmed if you sit a mock earlier in the year and your child is significantly below the high score for the paper.