How do you focus on what to study for an exam?

I always end up getting distracted and have the urge to go do whatever else my brain conjures.

Sometimes I suspect I can't focus on long term goals because I feel like every day is the last so I must do whatever I come up with and make sure everything is in place in case it really is the last day (for example, leave behind something nice to be remembered by like drawings).

It also seems like my brain is trying to read faster than what it takes to actually read each word so when I try to slow down everything feels like mush.

My handwriting also sucks for the same reason, my hand can't keep up the pace. Trying to write at a slower pace hurts.

What the fuck is up? How do I make this work. How do you guys study?