Tips for concentration?

It seems like every time I try and study or do homework, all I'm physically able to do is stare into space, daydream, get up and forget to sit back down again, etc. I do have adhd incase anyone was wondering, but the medication doesn't really work for me. Smoking weed helps but for obvious reasons I'm not gonna do it too often. Any tips for literally just sitting down and sticking to one thing? This has been a problem since I was a child but now I genuinely want to study.
Tips for concentration?
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