The problem with standardized testing is that it is intellectually lazy.
So why should you care about electron spin? Honestly, unless you have a passion for it as I do, you probably should not. Having a working knowledge with such detail of quantum theory probably will have no impact on your life. But, to live in a society at a time when experts are so arrogant as to be unable to accept that they do not know something, and publishers with such ill-informed editors to allow such enormous mistake through, should very much concern you.