Theres no evidence that setting works

Putting students in groups depending on their ability makes little difference to their learning. Although setting can in theory let teachers work at a pace that suits all pupils and tailor content, it can also create an exaggerated sense of all pupils being alike in the teachers mind. This can result in teachers not accomodating to the various different needs within one group and in some instances going too fast with high-ability groups and too slow with low ones.