Observer letter on private schools playing exam system

Any reforms which tackle the problem of state schools "playing" the examination system, and "end the incentive for schools to rid themselves of pupils who could depress their overall exam results" are to be welcomed, but they also beg an obvious question (Schools told to stop using exclusions to boost their results, 05.05.19). Why are there no measures to prevent schools in the private sector "playing" the system? They enter their pupils for Cambridge Assessment`s IGCSE exams, which have not been subject to the changes which have made GCSE examinations, compulsory in state schools, more rigorous? These exams are clearly employed to "boost results", just like the Pre-U exams, where coursework still figures prominently in the final assessment, are being used by most independent schools instead of the highly regulated and newly reformed A-levels.