Can anyone give me some good studying tips for a person with ADHD?

I have ADHD, and currently not taking medication. I am really behind in school and get anxious when I start working. I don't understand a lot of the material and I usually give up pretty quick. How do I force myself to do it? I'm going to fail and every time I try my anxiety just goes through the roof. I can't take medicine because I metabolize it too quickly and it doesn't even help. (120 mg concerta)

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