The best way to study for an exam in one night for me would be just to write down everything you know on a piece of paper and fact check everything. Also write down formulas and reasoning in case you need to explain a certain something. After writing everything down it's all fresh in your memory and if there are any parts of a textbook or some notes you don't understand, research on the internet for an answer then revise that. Try and get sleep as well, or you won't be able to focus during the exam.
Good luck! ☺
