Especially because you can get a 180 without being perfect lol. Being upset cause you don't go -0 is wasted energy--don't worry about it, hakuna matata.
On test day I had a ziplock bag with almonds, M&Ms, and cough drops bc I had a cold haha. Also nibbled on a Clif bar and sipped Vitamin Water to get an energy boost.
Y'all, just pre-hydrate! Drink a gallon of water today, tomorrow, and Friday. You'll be well-hydrated for the exam without having to drink much, if any, the morning of.