My student arrived 28 mins late for his H2 Econs exam because he thought the paper was in the afternoon. But he told me he did not panic and calmly completed the paper within the allotted time, a result of being well-prepared. (Btw, I’m not his Econs tutor; I only tutor him in H2 Math and H2 Physics.)
The moral of the story?
(1) Always double-check your exam schedule.
(2) Be well-prepared for exams, even over-prepared if necessary.
(3) Try not to panic in any situation; control your breathing.