Some people might wonder if they can achieve a better band score if they take the IELTS test back in their home country, but actually it doesn't make any difference in terms of the examiners. They are all trained in exactly the same way and use the same criteria. Also, the tests that you take are also very similar because the reading test, for example, will have 40 questions in 1 hour. The writing test will have two tasks to complete in 1 hour. So the actual test items are not different and the examiners are not different. They will rate you in exactly the same way regardless of where they are.