Most Helpful Guy
There are no deadlines to writing. Unfortunately, in your case there is but I'm not happy about that. I mean, do people think that some of the greatest writings came purely from pressure? You have "writers block" for a valid reason: the words aren't available yet. So now you have to fill in the blanks just to save your grades. I'm so glad I never went to music school to write songs and play/sing.
Most Helpful Girl
Something I do is to just write what ever comes to my mind. Any word or sentence I just write it all down. Don't think just write. It helps me a lot. It was hard to just write in the beginning but I taught myself to write without looking back at what I wrote til I was done writing random stuff. Afterwards I brainstorm.