I failed a class. Can I repeat it?

 Yes. You can repeat a class with a 'C-' or below and have the first grade not count toward your GPA. It was formerly a Petition to Discount a Grade. Beginning Fall 2009, the form is called a 'Petition for Grade Forgiveness'. There is a limit of 24 units which can be done as an undergraduate. The Grade Forgiveness form can be found online.