Doraemon - Nobita's marksheet has ticks on it


I noticed that Nobita's marksheet has all the questions ticked, yet he still
gets a 0.

[![marksheet](https://i.stack.imgur.com/vze6r.jpg)](https://i.stack.imgur.com/vze6r.jpg)

Is this a cultural thing where you don't put crosses on a paper or a mistake
on the part of the animators?

