Personally I requested a female doctor, that just happened to work in my favor. Just because it happens the male doctor is absolutely terrible but I didn't know that ahead of time. Anyway, I recommend you go get a copy of your medical records from your clinic. They will email them to you, or you can look through Genesis but they may not have everything.
Next if you have your records or not, look up C&P exam DBQ's they will be on the VA website somewhere. The most important exam is the general medical one. Behavior health one is important too. For the phone call prior to the gen med exam a nurse will call to go over all your claims for the gen med doctor. Have your medical records and DBQ's up on a computer so you can answer the questions they ask. They will want to know when a specific injury happened like what year, where were you, what did you do about it like doctor physical therapy or something else. Lastly the most important part is how does that injury affect you today.
I can't stress this enough, the phone call and gen med exam are the worst all of your injuries have ever been. Think of any injury and how it felt on its worst day, now all of them are like that for the phone call and the gen med exam.
Now don't lie about shit, they can clearly see your medical récords and can tell if you say my elbows don't bend and I have sharp pains.. The doctor says we'll I don't see anything in your records ever about this.. Something like that.
Little tip as well, to make sure I was real sore and felt real shitty, I slept on the floor two night in a row prior to my exam...lol
If you got any more questions just shoot me a dm or something.