As long as it's a reasonable test, you can argue its merits.
But on a site of mine, I've gotten so many e-mails complaining that I say "the data is" instead of "the data are", or arguing that either "what year were you born in" or "in what year were you born" or "what year were you born" are variously wrong, and only one is right (but they all seem to disagree on which one).
Beyond a certain point necessary for clear communication, one person's proper grammar is another's irritating pedantry.
The test covers a variety of topics, and you don't need to get anywhere close to a perfect score. And it really covers the basics: misspellings, usage of to vs two, etc. This is about basic communication, not pedantry.
Most people don't know where the dividing lines are between grammar, spelling, writing style, and typographic style. Cf. several posts on this very thread.
But on a site of mine, I've gotten so many e-mails complaining that I say "the data is" instead of "the data are", or arguing that either "what year were you born in" or "in what year were you born" or "what year were you born" are variously wrong, and only one is right (but they all seem to disagree on which one).
Beyond a certain point necessary for clear communication, one person's proper grammar is another's irritating pedantry.