Wear red undergarments (i.e., underwear, brassiere).
Kick your chair when you're about to leave, that is after you finished the last subject of the last day of the exam. Kick it in such a way that won't disturb the other examinees.
Leave your exam paraphernalia (i.e., pencils, eraser, sharpener, calculator, food [finish eating them and throw your garbage in the trash] etc.) on the exam room or give it to the PRC for donation, except your Notice of Admission (NOA), that is so important later on.
Once you leave the examination room, on the last day, never look back. Go to church and pray.