It's a quiz, so I took it. Since I was born in Britain to parents who strived mightily for middle class but began and ended up working class, and am naturally socialist, it's inevitable that I have a window in the bubble. And some of the questions I disagree with anyway. But YMMV.
Charles Murray is responsible for "The Bell Curve", so I'm not sure I want to read his book.
Also it took me about a week to fix their terrible HTML for the "certificate" so it would display.