how do i improve my study habits? i feel like i can only study for 2-3 hours a day before my brain becomes a fucking trash can

/sci/, tell me everything about your study methods. when do you study, how long, in what intervals, what sources you study, how you memorize / learn stuff, where you do it, etc.

i feel like i have it all wrong. i feel like a dumb person trying to do smart person things when i sit down and look at anything rigorous