Why do we wear different colored belts?

A Pre-Test is a test to evaluate the preparedness of students for further study.  As I was "re-mastering" the first seven Poomsae's, I wondered what kept getting in the way of my daily practice?  What was I doing all of this time?  Why didn't I wait until the next cycle to get it all together?  I convinced myself that this was the perfect time because this is a pretest, and I won't remember what I don't remember. I knew what to expect, but I didn't know what to expect. If I don't do it now, I'll never be ready.   I'd probably still have something else to get me off schedule.  Since I was given grace, in the form of a pre-test or a dress rehearsal, I now have several opportunities to prepare myself for the big day when it comes. This time I will do what I was supposed to do; Stay Ready So I Don't Have to Get Ready.