Kinda hard to say by my school. Since my school is a Selective school where everyone is academically skilled, they grade by rank not mark. So even though you received 99% for a test...if everyone else in the class got 100%, you fail that subject. (<---- SLIGHT exaggeration)

I haven't gotton "High Distinction" since Year 7 Latin. I don't know how either. That's top 20% of the grade.

I get "Distinction" for German, Geography, English and anything History related. That's the next 25%

I get "Credit" for everything else, which is the next 20% of students.

Maths is too embarassing to say. Let's just say that I go tutoring for a reason.