This is the explanation of CATs as per the 'teachernet' website
http://www.teachernet.gov.uk/teachingin ... cfm?id=327
CAT tests (Cognitive Abilities Tests)
Intended for children aged from 7-15 years, these tests feature:
verbal reasoning - with words and word structures and using words in context;
quantitative reasoning - with numbers and symbols, which indicates potential for achievement in science and mathematics;
non-verbal reasoning - with geometric or spatial elements, without verbal influences.
Although the verbal element is what concerns most English teachers, the tests are rarely taken in isolation, so the information passed to you is likely to cover all three areas.
Hope this helps!