Every Zone has its own grade boundaries. You are probably in Zone 2 or 3 because Distinction 1 and Distinction 2 are only part of your grades.
Here in Zone 4, we just have grades starting from A* to U. No Distinctions on percentages are allocated here.
Ah it's the same. Our result slips contain both the distinctions and grades.
The exception is that distinction 1 and 2 are both for A, for us.
Frankly speaking, no idea about the zone. Never heard about it here.