How do you guys « focus »

I know, I know. That’s the whole difficult part for all of us, but maybe you’ll have tips.

I’m an art student, and sadly for me, I also rly probably have ADHD. My psychiatrist can’t diagnose me til we stabilize my depression but it’s going the right way.. Except now I feel the full « adhd » part I guess ?

She made me a time table, because I wasn’t able to work for 2 weeks, but I struggle to follow it. It’s hard to estimate how long a task will take, what happens if I don’t finish in time or succeed (and I failed the first one lol). And then I have to work, and it feels like my brain is going the other way. I don’t have voices in my head but rly vivid daydream and if I’m not stimulated enough (if I’m surrounded by ten thousands things happening around me), I start to slip back in my head and it’s rly hard to fight, especially when I have no focus juice and my silly brains struggle at just staying on what’s happening in my sketchbook. I have videos/music on, I’m eating chips, but that’s not enough.

How do you guys do it ? My brain is ruining my studies. Idk what to do, even when I’m being held by hand I still find a way to fail. I feel like a broken tool.