In Poland, high schools have 1-6 grade scale (6 is the best), but universities have 2-5 scale (5 is the best, 2 is a failing grade). Decades ago, high schools a

In Poland, high schools have 1-6 grade scale (6 is the best), but universities have 2-5 scale (5 is the best, 2 is a failing grade). Decades ago, high schools also had 2-5 (or maybe 2-6) scale. I have no idea why the 1 grade is nonexistent.