Prepare the location of the exam in advance, and also try to do your revision in that same location.
Parts of the room and the things in it will remind you of what you have read and thought.
Specific sights, sounds, and smells are very effective at reminding you of what you were doing, thinking or feeling on previous occasions when you experienced those sights, sounds, and smells.
Let people know where and when you will be doing the exam – that way they won’t disturb you.
Make sure you are going to be comfortable in the exam space:
Collect up the supplies you might need during the exam, such as...
You don’t want to be wasting time doing this during the exam.
Now see how much you remember.