The first part of the test is a 'getting to know you' exercise by the examiner. However, do not be fooled by the easy questions and the conversational style. This is in some ways the most important part of the test. During the next few minutes the examiner will make a quick judgement of your English language ability.
During the rest of the speaking exam that judgement will be revised upwards or downwards, but this is where that important first impression is made. For example, if the examiner asks 'What is your name?' and you, perhaps because you are nervous, reply 'Yes, it is', then you will have to work a lot harder to show that you are really a competent English speaker!
Remember, if you are confident, and look as if you are looking forward to showing off your English, the examiner will assume you have a reason for being confident - that you have good English.