This whole cv thing is a quagmire and won't get better soon; nor will this thread. I believe the cv standard needs to be removed entirely but that will never happen; the system is simply too monolithic for anyone apparent in this thread to move it. Live with it; or else let it fester within you. In Aus, if you fail the standard tests already mentioned in this post there is one alternative offered as a last resort; that is a live lamp test done on-field with a CASA rep. Lamp in tower. CASA rep radios instruction to tower. Tower flashes red/green lights at cv retard. Latter stands there & sees nothing. Pay hundreds for the privilege. You get the picture.
To any young wannabes out there, don't get bogged down here. Take the cv test early with your local gp, you'll soon know.