My students learn a lot by watching subtitled movies. If you don't use subtitles in your mother tongue, your brain is forced to match the words you hear with the words you read. It also provides a model of fluent speaking. It's important not to listen to the same kind of English every time: try the news, films, TV shows, podcasts, audiobooks. This way, you'll be exposing yourself to a wide variety of situations and topics. You could use a podcast app which allows you to slow down the speed of the recording, so that it's easier to understand. I find the Downcast app very useful and my students love it!

My teacher recommended a book serise titled "step by step" and another teacher asked me to listen to dialogues or aticles again and again until I can write down them all. of course , you should choose the ones which are suitable for you . "Deperate housewives" and "The twilight saga' are suitable for the intermediate, because the dialogues are about dialy life. "Harry Potter" is more difficult than the two I said above, because there are a lot of professional words about magic. Personally , the British TV serise "Sherlock" is suitable for the superior., because the speaking speed of Benedict Cumberbatch is too fast. Even if there are subtitles, I still can not follow him.