Help and advice to claim tor Pip with ADHD

Hi everyone. I have posted in the past regarding my Partners Pip application. After a lengthy almost 15 month process he was turned down by the tribunal and advised to start a new claim as he has clearly deteriorated since the appeal went in last January. Despite asking for any further evidence which i supplied twice they were still only interested in how things were back in January! They have advised starting a new claim from scratch again. Is there anywhere or anyone who can help us put together a new better claim?