Your perception that he isn’t working as hard as you is distracting? That sounds like an issue with you, not him. If it’s the video games that are distracting you can always work at the library, at a cafe, with headphones in, etc. Really, this shouldn’t be an issue at all. I mean, what kind of advice are you even looking for here with something this miniscule? Do you just want a virtual high five for being so studious?