Here is another grammar point I have heard some students make when speaking. The differences between challenge and try and cheap and low. Remember that vocabulary makes up 25% of your marks in speaking and writing. So focus on accuracy and then when you feel more confident you can work on your range of vocabulary.
British or American English in IELTS, which is better?
Some people are confused about whether to use British or American English in the IELTS test. The answer is that both types are fine to use and also the IELTS listening test has various accents from English speaking countries around the world.
You do not get a higher band score in the speaking section for using a British accent either. Your accent does not matter as long as the examiner can clearly understand you. If you prefer to use American English spelling or vocabulary in the writing section, then stick to that when doing the exam, don’t suddenly switch to using British English spelling or vocabulary and vice versa.