Please maintain eye contact with the examiner while speaking and be confident with a smile. Feel free to ask questions for further explanation if you don’t understand, instead of shrugging your shoulders.
 
Remember to paraphrase the questions to prove you understand what he wants you to talk about, and don’t forget to conclude formally than abruptly.  Your introduction and conclusion are critical. 
 
The examiner may ask you an abstract question, which may last for about 4-5 minutes. Don’t forget to use your mind map or any note you are familiar with in the past. Writing down your key points is essential, and that can help you to remain focused.