Мне кажется участники дискуссии читают на английском >> , GCSE qualifications are only available in the UK and certain schools in a small number of other countries such as US [1] Canada, Australia and India. The IGCSE is by nature 'international' and can be taken in over 150 countries worldwide.
[1] the US universities will generally ask for GCSE's and AS level results, along with an indication of academic progress in the final (A2) year