Secondary teachers should be able to offer pupils alternative exam choices at different institutions, it has been claimed.
The Independent Academies Association has called on the government to allow schools the choice of whether to offer pupils traditional GCSE exams or the international version of the assessment, which is considered more challenging by many in education jobs.
Lobbying organisation the Campaign for Real Education (CRE) has backed the call, with chairman Nick Seaton commenting: "Individual establishments know which examinations suit their pupils best.
"Most subject teachers see that the international GCSE's stretch most pupils more than the standard GCSEs. They are also the best preparation for A-levels."
Mr Seaton also said that allowing those in education jobs to teach IGCSE courses in state schools and academy institutions would better prepare pupils for A-Level, thereby boosting attainment rates.
The IAA is the representative body for all of England's 200 academy institutions.