Applied at McDonald's for Unknown

I have an upcoming interview at McDonald's, and I'm feeling really anxious about it because I have ADHD. I struggle with processing long sentences, and it feels overwhelming when I have to think on my feet. In my previous interview, I messed up because I couldn't keep up with the questions. This time, I want to prepare better and not make the same mistakes. I need to find a way to simplify my answers to no more than 7 sentences, as that's what I can handle. I'm looking for strategies or tips on how to communicate effectively during the interview without getting overwhelmed.