Try to zen out and not overthink it.
If you have an appointment with a professional that diagnoses ADHD for a living, you will have a different experience than a general medical doctor.
If you overthink the evaluation or get too meta by wondering why a certain question was asked and what the correct way to answer it is… at best, you stress yourself out for no reason at worse you show anxiety over anything else going on.
99% of the time, your first thought when a question is asked is how you should answer.
You WILL be asked things not related to ADHD. That is apprpriate. We do not have blood tests that allow you to test positive for ADHD, so the assessor will need to systematically rule out alternative explanations (if they are good).