High School != College (Score 1)

So a couple of things.

1) Students in a high school do not have the same rights to privacy as students in college/the general population. What might normally be unlawful search and seizure may actually be allowed (see eg random locker searches).

2) Preventing cheating is a legitimate and compelling interest. I picked those words carefully. Why? Because when the court needs a test to evaluate a practice, those are two of the levels that they look for. Now, is this the least restrictive means? Probably not. But the school could argue that it is, as it does not force anyone to do any extra work.

3) It would be very nice if teachers could rewrite every class every year. But that's not the most efficient. Think of it this way: do you write code from scratch every time? Or do you copy and paste on occasion? Teachers are also taking questions more and more from the standardized tests that students will have to answer. Sometimes there aren't enough for multiple tests to be made.
Everyone is quick to criticize teachers when they see something go bad. No one ever thanks them for everything that they do that benefits society. That's why so many of them leave the profession.

IANAL, but I am a law student and a former teacher.