I know I've become a bit of an evangelist for electronic logbooks these days - but I've set mine (in Excel) to flash the date red at me if any of the expiry dates (medical, licence, class rating, instructor rating, IMC rating....) have expired.
Which does illustrate the point that any fairly well qualified pilot has a lot of these to monitor.
Anybody here ever accidentally driven their car past its MoT, had a rush to get your medical renewed? I certainly have. And dealt with it because perhaps I'm not as conscientious in the rest of my life as I am with my flying.
It happens, and just as an examiner will judge their student on how well they deal with their mistakes - the world will judge this school and examiner similarly. I hope they're not found wanting, because they certainly will have a perfectly good opportunity to sort themselves out.
G