who are you organising the lesson through?
i did my test at oakleigh (got off my p's at end of august, so did the test 3 years ago), and as for the do's and don'ts... ummm, follow the road rules!!! obviously being a learner they expect you to go slower than slow! hands at 10 and 2, head checks all the time, dont do any roll backs, they expect hand brake starts if on a hill etc, roundabouts - id recommend being in second as it means you have to slow down, which is a good thing, especially in the test! and means you dont have to come to a complete stop, but of course, always safer to stop, again especially in the test!