Here are the two approaches shared by my tutor on the “LISTENING MODULE”.
The first is to practice with podcasts, talkback radio or any other audio-only recordings. You need a clear focus - start with 10 minutes, then move to 15 minutes, 20 minutes etc. The purpose of this is to develop your skills of focusing purely on sound, but not music. The issue is that these days we rarely need to do this, so it’s a skill that needs to be developed and if independent of language learning.
The other technique that can help you keep concentrating is to create a mental image of the what you hear. Where are the people talking? What does the room , place look like? What are they wearing? You then need to add yourself to this mental picture. In the same way that we can be the third person listening to a conversation over dinner, for example, you need to place yourself into the scene. That may sound strange, but it works