Could be set in Anywhere USA
The "show runner" is American and it shows.
There is another similar thread where people are equating a statement that Class is "too American" with "this sucks so it's like American TV". I don't think that's what that poster is saying, and that's definitely not what I'm saying. There is PLENTY of terrible UK television that just isn't seen stateside unless you seek it out.
What I'm saying is that Class completely lacks a sense of place.
Doctor Who has a quirky sense of humour and a way of looking at the world that makes it very British. The show embraces it's Britishness.
If you were to transplant the action of Class to Ohio the only thing will have to change is the accents.
School life is understandably vague--the show isn't about school. But it's vague to the point that the education system is indistinguishable from the states. It's almost as if the show is trying not to be British, that it's trying to not alienate potential non-UK viewers.
And there are other more subtle things about the show that make it so generic that it doesn't seem to inhabit any specific place. And because it doesn't have a sense of place it relies on effects rather than plot and character.
There is a good show in here someplace, they just need to find where it is.