IELTS: What is it?
While the Reading and Writing exams are different in each module, the Speaking and Listening exams are the identical in both.
The most popular English language test, IELTS, evaluates your communication skills in English by having you speak to a test subject one-on-one. In other words, a real interaction with a real person is used to evaluate you. The most efficient and natural way to gauge your English conversational abilities is to do it this way.