The score system is different in Bulgaria. There was nothing like N% of the students get A. In fact - the class I've been in, graduated with 5.50 (6 is the max in Bulgaria), the other class graduated (averaged) with something like 5.75. I graduated with something like 4.40, and the other guy was 4.20, the next worst after me was 5.20 I think. About 30 people in the class.
I basically skipped a lot from the school, but because I was in the computer science (informatics) team, I've got A's (6) on certain subjects, because the teachers decided not to care. Other decided that I should be present more and I've got 3 or 4 - like C or D here in US.