Study

I have to study for examination.
I have studied hard chemistry.
But it's beyond me to understand.
I have studied only chemistry.
I recognised that I must study other subject.
For example, Chainese, English, Cooking and other four subject.
I'm not good at Chainese.
So I have to study hard Chainese too.
I have enough time to study all of subject.
Because I have a part time job tomorrow.
The examination will come soon.
I think I have to study more hard since today.
I want to a good grade.