It is not a lot of good "swotting like crazy" the night before an exam. A last-minute look through your notes is useful - but this should only be as a reminder. Before an exam, you need a good night's sleep and a sensible breakfast (I know I sound like a nagging parent - but it's true.)
Make sure that you have all the necessary equipment (pens, pencils, ruler, eraser, compasses, etc.) BEFORE the day of the exam. Running round at the last minute does nothing for your nerves!
In the exam room, settle down quickly and compose yourself. Take a few deep breaths to settle any "butterflies". Ignore what others are doing. When told to start, take time to have a quick look through the paper - just to make sure that the layout / sections / questions are what you were expecting.
Don't be afraid to make notes and jottings on the question paper or on your exam paper (This will show the examiner that you have planned your answer and can easily be crossed out.)
Try to spread your time sensibly between the questions. (There is not a lot of point answering Question 1 perfectly if you don't tackle Questions 2,3 and 4.) If you do run out of time - you can always jot down notes (or bullet points) instead of answering a question in essay form.
It may be a good idea to start with a question that you know you have revised thoroughly. This will help to build your confidence. Whilst you are feeling OK about things, perhaps you could tackle a more difficult question. It is not a good idea to tackle your best topic, then your second best, then third best, etc. - as this could simply lead to you getting more and more demoralised as your answers get shorter and less detailed.
READ the questions carefully - and make sure that you do what they say.
It is worth remembering that the best exam technique is to KNOW YOUR STUFF.
Hopefully, if you have studied these pages - and put some of the suggestions into practice - you will give a good account of yourself and get the results you deserve.