A few months ago a post by MCargobe under the title Improving your listening drew my attention. In that post, she mainly went over another post from PhraseMix with the title How to improve your English listening comprehension.
The short PhraseMix article touches on the reasons why English is so difficult to understand, to go on to give some practical advice for students to improve their listening skills.
Please, do make a point of going over the PhraseMix article. It's very short and you'll find valuable advice.
Along these lines you can also find the video below really interesting. It is from Anglo-Link and MCargobe included it in her above-mentioned post. The video mainly goes over the same ideas set out in the PhraseMix article, but much more thoroughly and with many more examples. It is quite easy to understand, and viewers get a lot of help to understand with lots of on-screen information. The YouTube captions are also really accurate.