My son was 11 when we did his neuropsych evaluation, so it may be slightly different.
We checked in, and he went with the Dr, my husband and I were told we had a few hours so we went for a walk.
My son did a bunch of puzzle type games, thinking exercises, the Rorschach test (at least he said he did), and talked with the evaluator about different things. It was done over two mornings, the Dr said she didn’t like to do them in one day because it can be tiring.
I think he did an IQ test, but none of these exercises are pass/fail - they just measure how the brain works. We told our son we were really proud of him for doing it, and for participating because it matters that we’re able to learn these things about him.