This isn't the US -- these grades are from the UK.

Although yes, the UK too is in this hybrid world where gas (petrol/diesel) is in litres, temperature is in Celsius, but vehicle speedometers are in miles per hour and feet and inches are very popular for height, measuring rooms and furniture, etc.

They're still miles away from converting.

That's just A levels (which are open to fiddling by the government of the day)

Universities have their own ideas

Seems like they're finding the path.