1. Using lots of filter words especially um,ah,well,so,I mean etc...
2. Trying to write your entire answers in Part 2.In Part 2, you will be given a card or with a question.You have one minute to prepare your answer.Do not try to write your whole answer just so you can speak afterwards.
3. Forgetting about eye contact.The speaking test is a conversation,so do not be shy to look into the eyes of the interviewer.