Sejarah 1st time get lower than gred a

pecah la....my form six sejarah 1st time get lower than gred a...want cry la...from form1 to 5,i just get a only...walao...sadsadsad...12/48..a lowest mark in my sejarah live...can retest or not?teacher say my tecnic menulis no good at all..but fakta can memorise well....hai!!!!!this loses my confident la...........next time i must get 17/48