College Grades Are Of No Use. *sigh*

Proof: It is a fallacy because you start with a normal distribution in the first year, and because the failing students are removed from the tail, the shape of the distribution in the second year isn’t normal anymore. In particular the variance is reduced. Using a normal distribution to score tests year after year artificially increases the variance by multiplying what is essentially noise. This mechanism ensures that the final rankings at the end of college are essentially meaningless.


I found this statement in a comment on THIS article. 


The question is:
What is the point of my 3.7 GPA in my last trimester now? :(