What are some ways to stay stress free for a test?

Tomorrow I take the ACT for the last time and honestly, my major college decision is based on this last test. I need to get a 29 or above and I have a 25. I know i can't cram but I am learning about the test itself and strategies. I have heard that the best way to take the test it to not have stress so what are some ways i can stay stress free during and before the test tomorrow? (Keep in mind, it is at 8 A.M.). Thanks!