In order to gain a pass on the practical driving test, you will need to drive to a consistently high standard without any assistance from the examiner. The examiner's role is to observe, not to help you.
You are permitted to make up to 15 'driving faults', but these must not consist of a serious or dangerous fault. One of either of these will result in an automatic fail.
At the start of the test, your examiner will check your provisional licence and your eyesight. You will then go to the car and be asked one 'tell me' question. Whilst you are driving you will be asked one 'show me' question.