Skim through the important questions - If you have a portion of the section left to cover, study all the important questions first. If important questions are longer to read, mark important points in the answers and try to remember keywords for each answer.
Don't Panic - Whatever might have been the reason for you not having prepared so far, don't dwell in guilt. Instead, trust yourself to make it big in the exams.
Get Aid from A Friend - A friend is the best teacher when it comes to last-minute preparations. Although you might feel a little hesitant to disturb them at an important hour, really best friends always make time for you.
Revise - What is more important than covering the left-out portion is remembering what you have already studied. So allocate a separate time to go through the pages and revise.
Stay Fit - When your brain gets tired, take a 15 minutes power nap and restart again for a fresh study session. Don't stay put in the same place and study.
Focus - When studying, a vital thing to follow is reading aloud. This helps you concentrate better and improve your engorgement. When you are distracted, you will immediately notice it.
Make notes for each subject -Make notes for each subject and list down all the important formulas, definitions, key points, etc. Don't list down all things that come across your way while reading.
Have a Proper Strategy to Learn Long Answers - Students tend to panic while learning long answers. Thus, to make it easy to engulf long answers make a strategy to do so. Either break them into small paragraphs for learning or write them down to learn.