In my time I have gone through three separate types of grading, so I'll start by summing things up haha.
In primary school (elementary) we usually used a system of checked boxes for effort and for achievement. I usually got ticked in the last box for achievement (which was the highest) and from the middle to last in effort.
In Middle School and High School we had A, B, C, D, E. I usually got A's and B's although there were exceptions.
In university we use Fail, Pass, Credit, Distinction, High Distinction. My grades do range but I rarely score less than a credit and I tend to primarily get distinctions and high distinctions.
Honestly I put minimal effort into study. I hate to study, but I love to teach. I consider myself lucky that I am clever enough to do as well as I do with minimal effort so I can reach that goal.