Life

recently, i always get bad score in my study! i always get angry easily and lazy to study! i really hate myself. i want to be clever and get high score in exam. tomorrow is my final exam in my top level but i think that i dont have enough knowledge to pass it and get high scores. i have cried for that reason. but it is too late to study. should i give up that study? i feel hopeless to myself. what should i do?
thanks for helping!