19. Don't put it off
'Procrastination' is the long word for it. And it means rearranging stuff on your desk, getting a sudden urge after sixteen years to tidy your room, playing the guitar, thinking about the weekend, writing love poems about that girl/boy you fancy, painting your toenails etc.... Sit down at your desk and GET ON WITH IT.
20. Don't hang around with the nervous, paranoid people before the exam
— these people will just stress you out, which doesn't help at all.
21. Dress as a medieval knight and demand ale
This is an old tradition, which states that anyone attending an examination in full knight's costume has the right to demand a tankard of ale. Unfortunately, you need to be carrying a sword and if you try this you'll be arrested and sent to prison.