[Yosei]

A: 4 points
B: 3 points
C: 2 points
D: 1 point
E/F: 0 points

I graduated with a 3.1 GPA, so my average grade was a B.

So let say...

Math: B (3 points)
English: A (4 points)
History: C (2 points)
PE: A (4 points)
Other class: B (3 points)
Other class: A (4 points)

Then add it up, divide the number by the number of classes you have, and thats your GPA.