IELTS Listening test is designed to test your listening skills. Basically, what examiners want to know is that are you able to understand, by listening, what native speakers talk? Therefore, Listening test uses varieties of accents such as American, British, Australian, etc.
Out of the above types of questions, MCQs and Labelling a Map/Diagram questions are the most challenging for the test takers. These questions are designed for a Band 8 or 9 candidate. So, you need to have an excellent command over your listening skills as well as vocabulary.