I got better at this by doing debate in high school. In most forms of debate, it's standard to take pieces of evidence and only read certain words to make it shorter and more concise.

The way I did it was this. I started with highlighting any sentences that provided information I considered essential to the article as a whole. Then I'd slowly just start bolding the stuff that was important from that. Then highlight everything from the bold that isn't redundant or bad writing. It was an endless loop for a while, but eventually I got to the point where I could just highlight with zero iteration because I got used to finding what is and isn't important.

I couldn’t tell you what my blood type is, but you can load up Contra and stick an NES controller in my wrinkled hands when I’m 90, and I’ll input the 30 lives cheat without hesitation.

I’d say I’ve got my priorities straight.

This is why I always hated studying, I continue struggling with this even to this day.

This is why I love my teachers. They make me a paper with everything I need to study and only the information I need so I don't have to go through the book and guess what I need.