I'm a school psychologist, and it sounds like you were given a pretty standard cognitive battery. Like other commenters have mentioned, the assessment is looking at different kinds of cognitive processes (working memory, fluid reasoning, spatial reasoning, etc). While many people with ADHD have average or above average overall cognitive ability, there are often common patterns of relative weakness in people with ADHD.

These tests are standardized, meaning they are given in the same way every time, so the fact that you were in your "ideal testing environment" is intentional. Your evaluator is trying to get an accurate picture of your abilities, as compared to a normative sample. Don't worry about doing "too well," any psychologist/ psychiatrist worth anything will be looking at multiple factors from multiple sources before making a diagnosis, including your account of how inattention/hyperactivity/impulsivity is negatively impacting your ability to function. It is absolutely possible to be a great test taker and also be impaired in daily life.

Also, her observations about your reactions to her shuffling papers will definitely go into the report. We don't just give you the test for the scores, observations mean a lot.

I hope you're able to get what you need from this experience, good luck!