I would prefer something primarily instrumental like Math Rock or Maidcore. Breakcore and DnB is fine too, but some songs have too many samples, are a bit too high tempo and distracting--not that I mind high tempo--and some I just don't like for no discernible reason in particular. I like Shoegaze too, but that's not an instrumental genre aside from a few artists like Seven Hour Days https://www.youtube.com/watch?v=eRDfOCvvWKs. They're alright, but not really my preference.

I like every song in this album
https://www.youtube.com/watch?v=TihhsyXxYRw
https://www.youtube.com/watch?v=_-NxwySNx_M

These Maidcore mixes are kinda hit or miss with a few songs. I only like some of the songs in them; there's too much variety in them. I like the ones that are most like the songs above. It's still good for the most part.
https://www.youtube.com/watch?v=gjx11RfLiIU
https://www.youtube.com/watch?v=tJG-jDQvSY0
https://www.youtube.com/watch?v=GKy6YnBRTTI

I like most of the songs in these mixes; it's good compared to what's passed off as a "breakcore mix" on YouTube
https://www.youtube.com/watch?v=M7CKRIozNYw
https://www.youtube.com/watch?v=coZqAEkze2I

Instrumental Math Rock mix that I really like and listen to often
https://www.youtube.com/watch?v=3egXqihisFQ

There was this one DnB/Jungle mix that I really liked, but I lost it. There was this one song in particular I really liked, and in the video, the background was stills of 3D renders.

Here are some mixes I found just now that I think are alright from what I've heard.
https://www.youtube.com/watch?v=w8cz-nLtyQw
https://www.youtube.com/watch?v=mupsjddCat4

If you have any recommendations for mixes of genres that I didn't include, that's fine too so long as they're good for studying along to. Something like high tempo Jazz, or Bossa Nova would be nice too. I used to listen to Lo-fi--stuff like Nujabes--back in the day, but I'm out of the loop and forgot who I used to listen to.