White coat syndrome might be helped by exercise in the gym before the medical.
Not as a one off, but part of your regular daily routines.
Get on a really good sweat, open up the arteries, and you will present with lower blood pressure, and might even feel more relaxed by doing so. Even more so on future visits.
This is a far better cure than medication which you fail to declare.
If that isn’t to your liking, arrange to see a Trick Cyclist, as there might be a deep underlying cause.
The UK CAA recently successfully prosecuted someone who was attempting an initial class one, and failed to declare some previous relevant medical history.