Yup, proctor should call 5min...or you could end up like I did when I sat in Oct '13 and they forgot...after that it was just panic and downhill from there.
Yeah from what I know they have never done 5 in a row yet... although I have seen the A B C D E D at least once... Once you do enough tests you just get used to it... but 5 would still make me panic haha