You must be "under care" before your internship starts & the PCA requires a one year internship. Also you must be "under care" to be examined for licensure.
Someone can correct me if I'm overlooking something, but I actually don't think that the above is true (at least, not at a denominational level -- I suppose some presbyteries could require this). I didn't see anything in the BCO (after looking at it carefully) that suggests that a man must be taken under the care of his presbytery in order to be examined for
licensure.
I say this because licentiates don't have to be "candidates for the Gospel ministry," nor do they have to serve an internship (even though licensure and internship are both part of a candidate's path to ordination). Am I mis-reading something?