Let’s think of the average parent that home schools their kid. I don’t believe for a second they’d do a better job than what is proposed here.
To be fair, the kids smart enough to cheat it would have, most likely, learned nothing in regular school as well
You can block off certain sections of the screen, or disable touch completely. If all the info they need is on the screen just make it so they can’t tap anything.
Is a giraffe a neck monkey?