How about a pair of wax ear plugs, blinkers and a nose peg? That should screen out most problems with other candidates. Then for the candidate who fidgets so much that your child's desk vibrates while they are trying to put the multiple choice slash in the right box, how about training your child to put up their hand and shout "I can feel earthquake tremors, and it looks like that child over there is the epicentre, get them out of the room please!"
I should probably be a bit more grown up about your reply mystery but it didn't half make me chuckle
I can see DD now wearing the nose peg! I think it was two years ago I heard that someone was sick but it wasn't cleaned up until a break, so a bit wiffy I'd imagine. Anyway we have been playing our little 'distraction games' at home when she is doing her papers. Hopefully if there are any 'distractions' on the day she'll have had them covered at home