I scored 8.5 for listening on my IELTS test first and final attempt. My tip is that you listen and write down exactly what you hear. It's pretty much like fill in the blanks. So the person's speaking will actually say what's written in front of you in a complete sentence. So pay attention to the word that's missing in front of you for that complete sentence that's being discussed in the paragraphs. Do not paraphrase or go over the word limit. Try to put exactly what you hear. Also it gets quicker for the last 10 questions, so you have to pay attention