my sad day =(

everyone plezz hear my feeling expression...i feel so sad today because i am only able to get 8.5 out of 20 mark in my exam it..actually i do revision before taking an exam but i dunno why i can perform as well as my friends.. i really hope that with my coming presentation i will perform very well and will get the full mark. my result is really affected me that is because i never got the lowest mark in my exam before..i hope that is the lesson for me to work more harder in my future exam....