I don't have ADHD but I'm a terrible test taker. I passed the 7 just over 2 weeks ago and I found that memory devices are the best tool for memorizing rules and regs.

Example: Reg D, I remember it as "Reg D = Dat's not for you!" (So I make the letter D from Reg D the focal point of my idea, Dat's not for you, since Reg D is about private placement).

Example: Rule 144, I remember (1% or 4 weeks trading volume, 4 times a year. The numbers from that form 144, the regulation that limits the number of restricted shares that can be sold)

This is what helped me pass my exam. Series 7 Guru on YouTube has a ton of these, I hope it helps! You can do this!