you really think they'd do something? unless you're being loud about it or disturbing others they leave them alone. someone had to be taken out of the exam hall during my gcse maths exam because they started crying and screaming. there were plenty who just cried quietly, and they were just left alone. hell, wouldn't surprise me if they didn't even notice considering it took me nearly 20 minutes to be able to ask for my pencil to be picked up (we weren't allowed to pick up anything we dropped, we had to ask an invigilator to do it for us) while frantically waving my hand in the air after the first 5.