420 is the maximum standardised score a DC can achieve in the Kent 11+.
Your child's score
Your child will get three standardised scores, 1 for English, 1 for maths and 1 for reasoning.
Standardisation is a statistical process which compares your child's performance with the average performance of other children in each test. A slight adjustment is made to take into account each child's age so that the youngest are not at a disadvantage.
The score ranges for 2015 results are:
English: 69 to 138
maths: 69 to 141
reasoning: 69 to 141
420 is therefore the maximum standardised score any pupil can achieve.
Grammar school threshold
To be given a grammar school assessment, children needed to get a total score of 320 or more, with no single score lower than 106.