In college, it's still not a bad idea to get familiar with the course material before the course starts.

But at least that isn't work that has been assigned.
I think I know a way to improve the sound of the earphones that came with your Galaxy S4. There are apps for smartphones that attempt to optimize the output for specific headphones, and they tend to produce a more dramatic improvement with headphones that sound bad.
Here's one for Android, it's called UBiO. I have UBiO for iPhone and it makes Apple's EarPods, and the earbuds that Apple sold immediately before the EarPods, sound a little better to my ears. There's also a long list of other headphones that UBiO supports. I'm not sure if it's worth the $5 though, because there are other cheaper apps for iPhone that do the same thing. Perhaps there are other apps for Android that do what UBiO does, except better.
Edit: Oops, I just noticed that UBiO doesn't list any Samsung headphones. Oh well, it's still a pretty good app.