S rank
A perfection in a subject. Flawless in whatever it is your doing. Getting a higher percentage or always at the top 100% rate.
Example:
Getting an A+ rank is commonly obtained by getting a 95% - 100%
Getting an S rank is obtained by getting 100% or more (usually by bonus)
Getting an A+ rank is commonly obtained by getting a 95% - 100%
Getting an S rank is obtained by getting 100% or more (usually by bonus)