Not everybody knows that there are quite a few differences between British and American English in terms of vocabulary, spelling and even grammar. If you have learnt English from a British, American or Australian English speaker, you probably want to know if your type of English is acceptable. In this post, I will answer this question.
What do the official IELTS organisers say?
IELTS is managed by a global partnership consisting of Cambridge English Language Assessment, the British Council and IDP Education (Australia). Although the organisers of the test are from a British/Australian background, the official website clearly states that both British and American English are recognised and accepted. The exam is designed to be international and the listening part includes a mix of native speaker accents from Australia, Canada, New Zealand, the UK and US.
Can I mix the different types of English?
The best advice is to be consistent. If you are comfortable with American English, then stick to American English. For example, if you are used to saying vacation instead of holiday, restroom instead of toilet, check instead of bill, then use what you know.
If you are not sure which words are British and which are American, check out these lists:
British-American English (A-M)
British-American English (N-Z)
By the way, Australian English has more in common with British English than with American English.

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Thanks a lot for your effort to help people to improve English! That’s great!!!
Thanks for the advice.
I am sticking to my American English as I am being too used to it.