Yeah, that's the thing. You CANNOT do work with music, TV, browser windows open, whatever. Everybody says they can, they say they actually need it, but any input to your brain other than the task at hand pulls you away.
An open browser window is too much of a temptation, but music and TV are something else. If I do not have music playing quietly in the background then my brain goes off searching for other sounds. It is so much
more dificult to concentrate whilst listening to the dog next door/traffic on the road below/wind rustling in the trees.
If a kid had a craft to work on, perhaps even a tedious craft (needlepoint, good model-building, tying flies) that took a certain amount of time to complete, they will have learned to concentrate, and what it means.
Building with LEGO is great for this. Just tonight I started building this;

and before I knew it, 2 hours had passed. I was watching TV as I built it, and even took a phone call part way through. The LEGO building has become second nature, so I could carry on building whilst concentrating on something else. Likewise background music has become second nature, and does not distract me from studying - not that I have to study much any more.
If you ever get surprised by how much time elapsed while you were doing something, then you've properly eliminated the distractions.
One time I set out some tables, put on the Star Wars trilogy VHS, and started building this.

I was ever so surprised to have finished putting all 3104 parts together in just 6 hours.
It is still scary though when I am playing video games, and look up to see that I've been going for that long, or more.
Anyway - background music may or may not help, but turn the Phone off...
and if the studying is too boring, then you must be studying the wrong thing. Change your courses if you can.
Edit.edit.edit. Did we have a server error while I was writing this? I accidentally submitted a half finished reply, and was unable to complete it for about a half hour during which I lost my train of thought. ;(