Saw this post from a teacher to his students and parents recently:

For those students who scored below 70 on the [subject] test, they will have the opportunity to do test corrections/rewrites to bring their grade up to a 70.  They will have class time Wednesday to work on this and all corrections will be due this Friday.  In class they were told how to set up their papers to do this.  Corrections are to be done on a separate sheet of paper and labeled.  Capitalization and spelling will count on the corrections for names. 

This brings to mind several questions for which I am not sure I have good answers.  Perhaps you do?

What’s so magical about a 70?
Why limit the students to a 70?
Why can’t the student who got a 70 (or 71, or 72, or 85, or 99) have the opportunity to “correct/rewrite”?

If we are all about learning, why do we create ceilings for our students to hit?  Why not build stages for them to perform?