It's still hard to tell the difference. Usually, if your average score in school (including your graduation thesis) is above 70%, it is Distinction (which can be translated into excellent students); If your average score in school (including graduation thesis) is 60%-70%, that is achievement, while your average score in school (including graduation thesis) is 50%-60%, that is "passing". Some schools don't have excellent (good) grades, and those with an average score of 50-69 are considered as passing.