ACT Essay Test

Hi! I take my first ACT on Tuesday, in order to prepare during class this past Friday we took a practice essay. I take APUSH so I’m used to having a strict format for what to write about and the order it should be, but when I wrote my essay I felt flustered. What are some ways I can write the essay, like maybe a format to use, so I don’t feel flustered. I especially get frustrated with what to write in the introduction and conclusion paragraph. Thanks in advance!!