>> should state schools be trying to raise standards by looking at what the private schools are doing
No, there should be more sensible options for the non-academic. It is stupid trying to get everyone to jump through GCSE hoops when it simply doesn't suit some people.
Agreed. My school has all students take IGCSE Double Science or separate Physics, Chemistry and Biology, which is harder than GCSE and does not have a single Science option.
There are a small handful of students who get two Ds or 2 Es in these courses. For some of them, taking a single Science GCSE might have given them a chance to get one C. An Applied Science BTEC could be another alternative option.
At least then they would get a passing grade in a qualification, rather than two failing grades which leaves them without a qualification in a core subject.
Private schools must be doing some things well to get the results that they do, but they are far from perfect.