In her research Dr Hallam draws attention to one school where a modular curriculum was introduced alongside the core curriculum for 16% of the time in Year 9, increasing to 28% of the time in Years 10 and 11.

BBC: Streamed classes 'demotivate'

One test of the exam makeover will be the impact of removing modular exams from the curriculum.

ECONOMIST: Tougher exams for England��s pupils