No, this is a language test; the examiner only cares about YOUR English.
20
How many parts are there in the IELTS speaking test? Can you describe them?
There are 3 parts. Part 1 is an interview. Part 2 is a talk. Part 3 is a discussion on broader issues with questions.
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What if can't answer a question either in Part 1 or 3. Can I say 'I don't know'?
Avoid saying 'I don't know'. Try to paraphrase it with another expression (I can't really say because I am not quite familiar with that but I think that...)
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What is the golden rule for the IELTS Speaking test?
To never fall silent (it's better to be interrupted by the examiner)
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How long does the speaking test take?
11-14 minutes ( part 1 - 4-5 minutes, part 2 - 3-4 minutes, part 3 - 4-5 minutes)
20
How can I develop my vocabulary for the IELTS Speaking Test?
There are many techniques not just one. Reading news in English is a good technique.