How does the next paragraph end?

How to figure out your college gpa
Write down your grades.
Write down a list of what classes you took during the term. Next to each class, write down the grade you earned.
Don't worry about writing down a percentage, just note the letter grade that you got. For example, your list may look something like this : Biology: b calculus: a history: a spanish: c Use a grading scale to note how many points each letter grade is worth.