Hi
You only need to look at the PIP Guide to Claims and Reviews.
benefitsandwork.co.uk/guides-for-claimants/pip. That is the first guide on the page. It is still very large, but if you look at the contents page, you can jump to the particular pages for the questions you want to respond to.
Only 27% of Mandatory Reconsiderations are won, whereas over 65% of Appeals are successful.
BIS