Should a soldier be correctively trained before a PT test?

No that's just a power trip. Gotta be smarter than that. If you wear that Soldier out of course he/she will have a reason for not doing well. Take care of it a different way.

As a leader you are responsible than more than taking care of a small situation. You are responsible for that Soldiers career. You might make an impact and have them remember what the corrective training was for what they did at the time, but by doing it and having them possibly fail a PT test you are setting them up for failure and that is going to be their lasting memory of the type of leader you are.

Yes - any pre-training should be welcomed.