Rounding the corner in to the final night prior to the Engineer in Training exam is a crucial time that could either make or break you depending on how you approach it. If you choose to use the time as cram session, you run the risk of not only being mentally worn out for the exam, but you instill a feeling of desperation that will lead to panic and test anxiety. These feelings are counterproductive to taking a good exam.
Instead, concentrate the night before on disengaging and rejuvenating your mind for the journey to come. If you feel the urge and have well organized notes, you can run through them prior to bed, strictly reinforcing, but not trying to memorize. The goal is to not study the night before, focus on relaxing, your performance will be much improved versus the alternative.
Check out the study guide for more helpful recommendations from my experience with the Engineer in Training exam.