It's common for interviewees to prepare answers in advance but there are things that you should avoid doing.
Image Don't get over-emotionalIt's good to express your emotions but don't lose control!
Image Not a job interviewIELTS interview is different from a job interview. Be sure to showcase your English ability, not your job qualification.
Image Tell the truthIt might be better to express a negative opinion if that gives you more to say.
Image Develop What You SayEven if you are asked what seems like a yes–no question, you are expected to say more.