The IELTS Speaking exam consists of three parts. Part 1 consists of a series of general questions for 4 to 5 minutes. PART 2 is the long answer Give a 2 minute speech on an everyday topic 2 Minutes plus 1 minute preparation time. PART 3 is a discussion based on PART 2 and it lasts for 4~5 Minutes.
The grading criteria for the IELTS speaking exam is as follow:
Fluency and coherence:
Fluency is about your ability to speak freely at a normal speed.
Coherence refers to your speaking being easy to understand.
To score highly you must correctly use higher level words and pay attention to your word endings (s, ed). In addition, you should try to show an ability to paraphrase and use colloquial language.
To score highly you need to use a variety of sentence types (simple, compound, complex) and also avoid grammatical errors, such as with articles and prepositions.
Your grade is influenced by the level to which your pronunciation makes it difficult to understand what you are saying, and also the degree to which you use language features of a native speaker such as intonation, stress, and rhythm.
IELTS speaking criteria official detailed guide for all four grading criteria