IELTS Writing Test Question:

Not everyone knows that there is a British and an American way of spelling words, and they are different. The question about the acceptable spelling came up a lot lately and I found out that many students are unsure how to spell words in the IELTS Listening, Reading and Writing tests - the British or the American way.
First, for those who have no idea what I'm talking about, let me explain: if you ask someone from the USA and someone from the UK to spell a word such as color, the American will spell "color" and the person from the UK will spell "colour". There are many other examples:
favorite (USA) - favourite (UK)
honor (USA) - honour (UK)
memorize (USA) - memorise (UK)
check (USA) - cheque (UK)