piggys wrote:
The International GCSE is an exam available to private schools and overseas schools.
Many state schools also offer, or have offered, this quite routinely. My sons' grammar school used a mix of IGCSE and GCSE for exams until a couple of years ago. The IGCSEs were in Sciences and English.
It sounds as though your daughter's school has probably switched from IGCSE to regular ones and is perhaps using books to cover elements of the syllabus which are similar. You could always go and ask you daughter's head of year or send an email if you are worried.