Worried my class

When I was in my writing class today I got a chance to talked to my teacher and I told him that I am worried about the coming final exam. He said that I am doing well and I improved a lot with my writing and if I want to I can practice more by writing more and give to him so that he can check it for me. Every week we have to write essay for 300 words and sometimes I do not know what to write but he is so good of giving some examples and he is pushing us. In few weeks we have our final exam and it will be all essay writing. I do not want to fail because I do not want to come back this class again. He told me not to worry too much and I am fine.