AIBU to think that there is no way GCSE preparation for every subject can all be done independently at home?
Do the DC have tutors?
Where do they sit the exams?
Do home schooled children even sit exams?
How do home school parents prepare their DC for GCSEs?
As you can see, I don't know how it works. I only know how much work the teachers at DC's school put in to getting them through these exams!