Last year, after I got my first grade back, I went through and did a spreadsheet that would calculate my GPA based on any combination of grades for the rest of the classes, A+ through D+.
That took a really long time.
That said, it was really, really satisfying whenever I was able to delete fields that represented grades for class X that were lower than my Class X grade. When all of the grades came in, and my 1st semester GPA came up, I pretty much died (in a good way.)
I do not recommend doing this
Also, apparently I was misunderstanding the grading scheme, so I needed booze in re my grade, but it was for good reasons, instead of bad.