I started out with 178 kids. I ended the year with 164. I failed 18 kids out of the 164, or about 11%. It would have been 19 if not for a SPED teacher taking the test for one kid. I can't prove he did it, but I know he did as the kid never scored that high on anything before.
I looked at it this way, if they can't remember what the 13th amendment did in a 90% black school, don't know what the Declaration of Independence did, don't even know what the stars and stripes on our flag stand for, then they can fail.
If the school board or principal doesn't like it, f them. I will not pass a kid that knows nothing just to pass them. They can retake the class with the other teacher as they must pass it to graduate. If they give me grief about passing kids that know nothing, I will go back to my original line of work and make 3 times as much as I do as a teacher.