since the exam is tomorrow, the best tip I can give is have a plan. all the content you could possibly know is in your brain, some people last minute cram but I don’t recommend it (this is giving math vibes I’m assuming it’s math rn). read over all your classroom resources to see if there is any obvious topic you’ve missed. check the formula sheet so you know what you have to memorise and what you don’t. the most extra marks you’re gonna gain now are from good exam technique - do you have reading time? if so, how do you spend it? do you start with multiple choice or leave it until the end? if you have time left, do you attempt the questions you couldn’t do or check your answers? how do you check your answers? if you can answer all these questions, then that means you have a good exam plan! if not, you’ll usually be fine, but having a plan helps when an exam goes very strangely or not according to plan (for me at least). how do you tackle difficult questions? do you rush? good exam technique can also help reduce silly mistakes (something I fell prey to a lot).
finally, deep breaths! if your close friends stress you out, then avoid them before the exam. some people like last minute revision, and some people hate it - find a group who has the same vibes pre-exam to you. remember; this is one of many exams, and you’ll be able to make it up if it doesn’t go to plan. the first one is always the hardest one.
hopefully this helps!