12.5? Damn man, you must really suck at spelling! har har, jk. (alluding to the 'percent' system we use here in Canada)
How exactly are you graded in school? I've heard of the number system (4, 3, 2, 1, R which is the same as letter grades A, B, C, D, F) and percent, where 50% or 60% is a passing grade (Depending on the school/curriculum. 50 was a pass for gradeschool/highschool and 60% is a pass for me in College).