To delete a grade, we must re-access the activity for which the grade was registered and select the child whose grade we want to delete.
On Android, this action is done by a single long press on the respective child, which will open a confirmation of the deletion of the grade.
On iOS, you have to swipe left and the delete option will appear.
On the Web platform, once we open that activity, on the right side you will find a red button to delete the rating.

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