Hopefully we'll end up with a generation of people who can cope with any crap thrown at them at short notice, and the ability to cope with uncertainty.
@LynetteScavo My DD is autistic, so you can imagine how much fun we're having with all the unexpected change at short notice and huge uncertainty!
And yes a 'surprise' maths test or surprise anything test would throw DD.
I'm not sure if DD is giving revision. I'd mentored revision to her a few weeks ago and she see said the same as your DD tree. But she said today she'll be doing work over the half term. Some of that is homework and some will be revision tests/materials they're given.