Private schools in the UK get a fair bit of flexibility in what they do, some (I believe) will even start doing separate physics/chemistry/biology before CE. B

Private schools in the UK get a fair bit of flexibility in what they do, some (I believe) will even start doing separate physics/chemistry/biology before CE. But state schools... well I've honestly no idea, the last time I was attending one was when I was 7. But I would never presume to guess what they do based on my experience of what private schools do - they're far too different.