Grade Point Average...
like if you have 7 classes

math-------B and you A=4
art---------A get a letter B=3
PE----------C grade for C=2
language----B each. D=1
home room--A F=0
science-----B so you have
history------B 3, 4, 2, 3, 4, 3, 3
your GPA is going to be
3.14