Pressure tests whether preparation reached your nervous system.

You can know something intellectually and still find your body doing something else when the moment arrives. Preparation has only really landed when it reaches the level of reflex, when the right action happens without needing to be recalled. Pressure is the test that shows which of your knowledge got that far and which stayed theoretical.

After a difficult moment, look at what you did rather than what you knew. Where the two diverge, the preparation was incomplete. Practise those specific pieces under conditions closer to the real thing.