The Compensation and Pension exam is the single appointment that most often decides how a VA disability claim turns out. It is not a treatment visit, and the examiner is not there to make you feel better. They are there to document the current severity of a condition and answer a specific set of questions the VA sent them.
Knowing that changes how you should walk in. Veterans routinely undersell their symptoms out of habit, pride, or because they happen to be having a good day. The exam captures a snapshot, and that snapshot becomes evidence.