1- Fluency and Coherence
This refers to the flow of your speech and its relevance to the topic. It is the pace at which you speak and how connected your sentences are without unnecessary pauses to think or find words. Your speech should also be structured in terms of the order of ideas and reasons you give in relevance to the topic.
You should use linking words and discourse markers to add details while making your speech smooth and continuous. The objective is to speak naturally so the examiner can easily comprehend without extra effort. They will need to see you speaking, so avoid yes or no short answers. Instead, try to elaborate and provide supporting information. You should also be spontaneous to make your speech enjoyable.
Now, if you are asked about a topic in which you have no personal experience, such as visiting a museum, you won’t have a memory to describe, so your answer will be short that won’t provide evidence of your speaking skill. But if you decide not to tell the truth in IELTS speaking, you will need to think more than usual to come up with ideas such as remembering the museum you have seen on the TV. This will interrupt your speech and hurt the fluency of your speaking. It might also change the tone of your voice very visibly.
So, if you have an excellent memory, imagination and storytelling skill, then you can come up with a white lie and make your answer more exciting and elaborative. This will undoubtedly help your mark! The point is stretching the truth will facilitate the delivery of your idea in a long enough time frame, but running out of ideas will interrupt your thought process and speech flow.