I agree, though, that the school should have absolutely NO ability to interfere with the test taking; how else could the public be assured that the school is not giving answers or something else to increase the kids' averages to make the school look good? Ummm,... I have news for you... Even when I was in school, the proctors would go by, look at my paper and make comments like: "Make sure you're answering the right question.", "Don't forget to check your math.", or just "Hmmm..." You knew.
I NEVER had that happen in school. The teachers gave out the tests, and simply watched to make sure no one was cheating.
Of course, that was 35 years ago, and we didn't have the assessment tests the kids have today, that can make or break a school.