This is not a SFW instance. NSFW communities will be tagged, and efforts will be made to keep SFW communities clean, but proceed at your own comfort level.
Usually you start off with A-B-C-D and then add S when something much better than A comes around. For example, if these are academic grades, A-D might be given based on how many questions the student got correct, while S might be reserved for a perfect score, or for finding a better solution than the one the teacher had, etc.
Usually you start off with A-B-C-D and then add S when something much better than A comes around. For example, if these are academic grades, A-D might be given based on how many questions the student got correct, while S might be reserved for a perfect score, or for finding a better solution than the one the teacher had, etc.