According to the IELTS Speaking test scoring criteria, 25% of your score is based on ‘grammatical range and accuracy’. This refers to number of different grammatical structures that you can use in your speaking, and how frequently you make mistakes. In this post, I’m going to share another nice video by the British Council which explains this criteria and includes some tips on how to improve your grammar.
What is grammatical range and accuracy?

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Video not on grammatical range and accuracy!
Thanks for pointing this out. The video is corrected.
You write so holnstey about this. Thanks for sharing!