idk what to do anymore please help?😓

hello i’m so sorry for this huge yap but i would really appreciate any help thank you💗💗
i have exams and i had the easter holidays (2 1/2) weeks to revise for them, and i ended up barely revising anything. it’s not because i didn’t want too or i maybe i was lazy, ive thought about that may be the case but i believe i really did try. at the start of the 2 weeks, i tried to revise everyday or as much as i could but i ended up wasting the day. i guess i realised that maybe i set too ambitious goals for myself because i wanted to follow a timetable i had made that would make me revise every hour of the day from 8am😭 so i tried shortening it but i just could never stick to it. over the years, i have made revision timetables but i never followed through with them. i would instead end up doing one topic on one subject the entire day and barely do anything else or i would end up underestimating how long id take on the one subject and take longer or i would just get distracted and do something else. i really dont mean too, it just happens every single time.
Instead of revising, i either would sit there doing nothing or just doing ANYTHING but revision. i didn’t mean too and i felt so guilty every time i wasted my time. sometimes i feel like my brain doesn’t want to do it but every other part of me wants to i just simply and physically cannot do it. over the easter break, i would barely do anything the first two weeks until for a few days i just gave up and was exhausted for no reason at all because i hadn’t even doing anything why was i exhausted?? i wasted day after day and i was miserable. i began thinking that this wasn’t the first time this has happened, truth is, i wasnt a good student but i got by, i relied on last minute revision and winging tests my entire life. i had picked to do art at the beginning of the year because i had always loved it and i wasn’t terrible at it but then dropped it because i couldn’t hand in my work in time and lost so much sleep because i would do everything the night before and would stay up until 4am to do it.
but this was kind of weird for me because i always managed to do my homework in time and to bring it in most of time, so im not really sure why im struggling so much?
i mean i guess the only time i could find a similiar experience to this is that i would take forever to do my essays. for english coursework, over the christmas holidays i would take the entire time just to finish an essay and end up just finishing 75% of it the night before.
i guess i feel like it’s the big, long homework’s im struggling to do. but just typical normal homeworks i did in time, and i didn’t really have any problems with that.
i feel so guilty and sick of myself, i know if just worked more and harder i could achieve the grades i want and i do really care about them but i just keep doing this. i have tried other things like drinking more water and sleeping more but it doesn’t seem to help with my focus and my productivity, ive also tried moving to other places to study like the library and cafes. that seems to work better for me as i feel like im already putting the effort to do something so in a way pressures me to do it, but even doing that, i still end up wasting my day by getting distracted by my phone so i put that away, but still just staring off to space and just wasting time by not doing anything at all or doing useless things. i don’t know, i just feel like time just slips away so fast if that makes sense like i don’t have control over myself. i know that’s weird and dramatic lmao but i kind of feel like im losing my mind.
tomorow i have three tests and i haven’t done anything all weekend so i’m cramming it all tonight, i do this with every single exam, i really wish i could be productive i am so sick of myself, im failing all my subjects i dont know what to do.