At the start and end of the year, both Mathematics and Literacy standardised scores are based on a nationally representative average (mean) score of 100 with a standard deviation of 15. This means that approximately two thirds of children are expected to have scores between 85 and 115.
Please remember that standardised scores are not percentages. A standardised score of 100 does not indicate ‘full marks’; it is the average (mean) score. Consequently, it is likely that many children will achieve a score of (or close to) 100.