“At least, bus teachers to different schools so they aren’t administering their own students tests. “
What, so they can erase and change the answers that are correct (to pull down the average)? Just kidding. It’s like leaving a Penthouse Magazine on a guy’s desk at work and telling him he’ll get fired if he opens it.
I don’t know why you added “just kidding” after your perfectly reasonable suggestion, unless it’s because the idea that the teachers might recognize correct answers is humorous.