Major exams also require physical conditioning. Stay away from sugary foods, stick with protein and believe it or not, study with Baroque music playing in the background specifically Mozart-I passed a state exam doing this.
A quick memory tip is to make up a game of association,i.e. Please Excuse My Dear Aunt Sally for the math process of what procedure to do first.
Another idea, once you have read and underlined main ideas, is to paraphrase everything in your own words and your own way. Some students like to create a visual using their own outline, web or the standard reporter questions: who, what, when, where and why, how, chart. Small study periods make more info retainable and also works best if the length of time stays the same, if you know you can study 45 minutes at lunch, 30 minutes before dinner and 1 hour after dinner, that's what you do.
if you have a choice of day and time for the exam, chose when you are the alertest. The day of the exam, relax, no cramming and bring a protein snack to eat just before going in to the room. Cheese sticks, a yogurt, nuts-anything protein and NO sugar.
Good luck and I hope you do well. JA McKay