
This should be common sense, but ...
I see too many posts from people who get completely blindsided by their C&P exams, or who don't understand why they got a 10% rating when they thought they deserved 50%.
If you want to know specifically how the VA is going to grade your condition, you need to be actively reviewing the Public VA DBQ website.
The idea is not to memorize a script, but to use these public records as a tool to audit your own medical information and see if you meet the criteria for the corresponding rating.
There are other sites with similar information, but the link above is directly from Veterans Affairs.