A sane world would give partial marks for correct working-out, in the event that the answer was wrong, not make full marks dependant on showing all working-out.

Which feeds into the bigger point of "intentionally gimping gifted kids into a schema meant for the drooling retards in their class" that plagues all education.

It really is abominable. Kills their passion, makes them lazy, robs them of ability to pay attention...