the beginning of a tough month

Today is the firday come to school after the spring break. I had a wonderful spring break, and I almost forgot what is the school life. However, after one study, I felt big stress from study again. I will take the ACT writing test again in May 15th. I must pass it this time becuase I will come back China and cannot take the summer class. However, how can I say must. I never say must in my life. My essay of a story in the English class is not good as formal essaies in the same class. My teacher like something about love and sex, I don't have such kind of story.