The CAT4 score is used mostly as an internal measure of development in the schools that make use of the assessment, and although there is no formal need for a CAT4 score, it can help teachers to plan lessons that will support children where they need it and stretch their abilities where they are already strongest.
The CAT4 is mostly a diagnostic tool that demonstrates where a student is now in terms of their cognitive ability, and where they are predicted to be later in their educational life – and it can also help to prepare them for a future career by highlighting their strengths.