Recently several people have asked me to help them improve their listening scores. I think they were hoping that I would give them a new technique or some clever advice.
Unfortunately, there are no special techniques for the listening test, and my normal advice to students is that they simply need to do lots of practice.
The people who do well in the listening test are those who have a "good ear" for English. In other words, they are able to follow fast speech and distinguish individual words easily. How did they develop a good ear? They listened to a lot of English.
If you're trying to improve your listening score, stop searching for techniques! Spend your time listening to as much English as possible. Expose your ears to the language and they will gradually become better at hearing it.