Stressful times and especially if you're behind with you're revision :-(
Best to prepare well in advance so you can cope with the unforeseeable events such as sickness, family emergency, or anything else which may prevent you from revising.
Look at past exam papers- Or if you're at University speak to your course lecturers as they tend to write the exam papers and will give you an insight on what may come up and how to revise.
Read Surat Yaseen on the day- This will help you greatly in sha Allah and put you in good spirits.
Make a timetable covering every single day leading to exam and
STICK to the timetable, allowing breaks & chill-out time.
Treat yourself every now and then for sticking to schedule.
& FInally,
You are what you THINK - if you think you can, you can & if you think you can't, you can't