Is the PIP assessment based on what you put in the PIP application?

Good luck for next week. Reading through what you've written is a good idea. Just to add, whilst you're making notes, if you hadn't given a couple of detailed explanations for each applicable activity/descripter as to why you have difficulty think about that now. How was it difficult, when did it happen, who witnessed it, was there any consequence to it? Also can you do an activity safely, to an acceptable standard, repeat it as often as would be reasonably expected, & does it take you longer than someone who doesn't have your disability?

Just be yourself, & ask them to repeat any questions if needed too.