This article, an extract from the author's book "Head on the Block," describes how the purpose of the school examination system has changed such that now it is to evaluate the performance of teachers rather than the performance of their students. It highlights some of the negative effects of school league tables--in particular, how the pressure on schools to improve results year on year and the tactics employed by some schools to achieve this have led to a distortion of the curriculum and a move away from real education. Can schools which claim 100% A* to C success at GCSE for "all" their students be genuinely comprehensive?