Whats the best way to treat adhd (by yourself)

I miss deadline after deadline and half ass everything due to the last minute rush

this has been ruining me for years and It’s just a matter of time until I get completly btfod and thrown out of my Uni

before the lockdown I could at least go to the library but inside my home I’m a lazy degenerate bum with no self discipline/control
I just want to have a todo list/calendar and have at least a little bit of structure in my life