Needless use of AI to fuck-up a non-problem
When I was a young warthog (when heeee was a young warthoooooooog) they used to have us all sit in a large room and have a human being "watch" us (mostly by the expedient method known as "reading the newspaper").
I can't think of any reason bar stupidity or greed why you shouldn't be able to just pay a human to do the same invigilation job that the AI is failing at. Put 30 cam feeds side by side on the invigilator's screen, have them sit down in front of a wall of faces while they sit and read the newspaper. Job done. You don't even need the invigilators to be able to see all cameras at any given time; if they're flicking through cameras at random, and the exam-takers know this, and the exam-takers don't know whether or not they're being watched at any given moment, then that's just as scary as being constantly watched. Just ask Michael Foucault.
Or... better method... say "fuck it" to exams and grade coursework instead, which is arguably a better approach anyway.