best study tips for someone who has severe ADHD?

I'm genuinely trying to be more motivated and to study harder and study after class and stuff but I get extremely distracted‚ it's like my brain says it wants something to eat then it closes the window‚ I open it and go back to something and then my brain just jumps off the deep end and it's like it lets me know it's thinking of the most random, unreasonable‚ out in left field shit and then I get extremely anxious‚ my eyes water‚ my nose runs‚ and I just feel extremely overwhelmed and stressed afterwards‚ so after that I just give up. I'm really trying to stick to my routine for now but I'm on my second day‚ I'm really trying to stick to this one but I know I might just give up eventually. What genuinely works for someone with ADHD? I'm really having trouble afterwards‚ I study for like 30 mins then I go through a mental‚ emotional‚ and physical shit show after that and just end up giving up. Any advice?