There is also another problem with modules. Schools probably spend about 6 weeks building up to an exam period. This means that over the course of a 2 year sixth form, students will have spent 6 months in "exam mode", rather than learning new stuff. It is as a result of this that the breadth and depth of A levels has dropped hugely since the modular system was introduced. Students are spending well over a quarter of their sixth form revising and preparing for exams, meaning that they spend well over a quarter of sixth form not learning anything new. This is probably the main reason why Oxbridge etc. require students to go above and beyond A-levels during sixth form, with STEP, TSA, AEA, HAT, PAT, ELAT and so on. They do this because students come out of their A-levels simply not prepared for uni, because they haven't covered enough.