I was looking for this recently and came across this on a schools website:
Guide to understanding Key Stage 3 levels
The following is an indication of the meanings of each of the levels we use to describe performance at Key Stage 3.
8a ? High level 8 ? Exceptional Performance
8b ? Solid level 8
8c ? Low level 8 working slightly above level 7
Level 8 would be exceptional performance in that subject, students achieving level 8 at Key Stage 3 would be expected to be capable of an A*/A at GCSE
7a ? High level 7 ? working towards level 8, Exceptional Performance
7b ? Solid level 7
7c ? Low level 7 ? working slightly above level 6
Level 7 would be High level performance in that subject area ? Students at this level would be expected to be capable of achieving the higher grades at GCSE (A* ? B)
6a ? High level 6 ? working towards level 7
6b ? Solid level 6
6c ? Low level 6 ? working slightly above level 5
Students at level 6 would be expected to go on and achieve a minimum of a Grade C in GCSE examinations in that subject
National aspiration is that all students work towards a minimum of level 5 by the end of Key Stage 3.
5a ? High level 5 working towards level 6
5b ? Solid level 5
5c ? low level 5 ? working slightly above level 4
Level 5 ? Average performance at Key Stage 3 ? students at this level would be expected to be capable of achieving a Grade C at GCSE in that subject area
4a ? High level 4 working towards level 5
4b ? Solid level 4
4c ? Low level 4 ? working slightly above level 3
3a ? High level 3 working towards level 4
3b ? Solid level 3
3c ? Low level 3