How to focus on studying as a adhd person ??

Hi guys !

I'm studying a subject that has a mix of a lot of theory to memorize and math/problem-solving, and I'm struggling to stay focused for long study sessions.

For those of you who've dealt with something similar:

-How do you structure your study sessions?

-Do you switch between theory and math, or finish one before moving to the other?

-What helps you maintain focus for 2–4 hour study sessions?

-Have any supplements actually made a noticeable difference for focus or mental stamina?

-If you have any study techniques that worked well for balancing memorization and problem-solving, I'd love to hear them.

Thanks!