What is your policy on allowing students to retake classes which they have already passed?

We have a number of seniors who wish to retake classes in which they received an A- earlier in their high school careers.  The purpose is to restore their 4-points so they may be considered for Valedictory honors.  This is uncharted territory for us. This situation has come about because we base class rank solely on an unweighted GPA. Thus, Val and Sal often become a farce, going to the kids who are the most GPA conscious and not those who learn the most!!!!!!  Any ideas or suggestions?????

Thanks,

 Dennis Peacock

Hesperia High School