the The more irritable I become, the harder it is to catch up

i am I was very irritable recently because of the postgraduate entrance exam.
the The math is so hard for me, so it makes me irritable, and the time flies by. This then i makes me read faster and so I understand it even less,won't understand most,becoming making me more irritable still. the It's a vicious cycle. i I didn't study english English and other lessons much/at all, the in time the exam will come, i and I am so worried about it. i I don't have no enough time. i I have no hope. i am I feel sad and depressed. how What should i do? i I want to cry! 

maybe Perhaps I i should settle to down and change my irritable character. it To do this however is a little hard for me.