I know because I tried almost everything.
I have been through phase after phase trying to figure out how to concentrate. I tried concentration music. Meditation. Studying while watching videos of other people studying. Focus sounds. Timing myself. Task lists. Measuring everything by goals.
I woke up early. I exercised. I took breaks every five minutes. I stared at a wall trying to βresetβ my dopamine. I went for walks after waking up. I made sure to get sunlight.
I installed social media blockers. Deleted my social media. Reinstalled it. Blocked it again. Unblocked it. Locked my phone. Locked it again. Left my phone in another room. Turned it off. Put it in grayscale.
I tried Pomodoro. Filled in little squares. Recorded myself. Changed locations. Studied somewhere completely different. And a lot more than that.
I did almost everything I could think of.
Eventually, I stopped looking for another hack and started building a repeatable way to work. That is the method behind this.