All of my exams so far have been in the hall along with a load of other exams from different years. Most of the others have ended before ours, so we are told by the invigilators to stop writing whilst they send everyone out of the hall, which breaks your momentum. I would rather they put us in a small room on our own than have this system.
Also, is it just me or are invigilators purposefully annoying? In the English exam today one woman clumsily kicked my pencilcase, which was on the floor, and then proceeded to bend down to pick it up waving her backside directly in my face. I can't concentrate on writing about the clever intricacies of Hamlet's figurative dialogue with that thing confronting me.
Could you imagine marrying an invigilator, they'd have a habit of peering at you constantly whilst eating your crunchy nut cornflakes, timing the length of your showers and urging you to do everything "in silence", even if you're cutting the hedge with a chainsaw. Control freaks.
Another thing that bugs me about exams is the way they whisk your paper away as soon as the time is up, leaving you with no chance to read or reflect on what you have written, even if you can't change it. Also, I would question the wisdom of having two clocks in the hall reading two different times and writing the official start and end times on the board in size 2 font, requiring a telescope to read it.
Also, the chief examiner at my college has a large, protruding chin which I have mild obsession with; every time I settle down to begin a paper I can't get the damn thing out of my head: "In this extract, Shakespeare uses chin to show Hamlet's chin towards his mother chin." etc. I'm pretty sure I subconsciously slipped a chin during my General Studies paper. It probably wouldn't have damaged my marks on that one to be fair.