Because it is the area where boys leave girls far behind. Nature, realising that females have only 30 or so years to have their families, gets them to 'put a spurt on' in the growing-up stakes. The boys' tables were weighted in their favour because it was realised that in the secondary sector boys would start to catch up, and after puberty, pass the girls in accomplishments. The book Why Men Don't Iron explains in great detail the scientific reasons for all this and, gradually, the media are now having to come to terms with it. The Independent, a UK newspaper that has supported the feminist cause over a number of years, surprisingly published some of the results of research into boys' better performances at 'A' level.
Girls lack sparkle.
Boys take risks. The researchers questioned teachers as to why boys outshine girls at A-level. Their writing is very clinical, point, point, point. As these boys grow into young men they become even better at thinking clearly, showing initiative and making decisions which is why the business sector prefers them to women as their managers and directors. The aim of the books is not only to provide information but also exam techniques for getting better marks.