Crap, I just lost my whole post due to a finger malfunction.
Basically, during the written exam keep track of where you seemed weak and brush up on those areas before the orals.
Remember safety, as has been pointed out.
When you get into the exam type questions in the higher tickets, make a point to remember the 9 asked.
Study the 3 you didn't answer, brush up on the ones you were weak on.
You'll be fine, it is a stressful process and it shows the Examiner how you deal with situations.