This is why trying to rank/judge/grade everyone by a uniform standard is almost universally terrible.

Students should be encouraged to try their best in every subject, allowed to make the mistakes they are naturally going to make at whatever level they are currently, and helped to improve over time. Punishing people for being less prepared than peers who did more practice or for making ordinary and expected mistakes actively gets in the way of their learning, as well as making them feel terrible. It's pretty bad for the students who are more prepared as well, as many of them internalize the idea that they are inherently good at some things and inherently bad at others, which is sometimes temporarily gratifying but often stops them from pushing themselves to try anything new or hard.