Bonjour Andrew, 'Mention assez bien' is not a French phrase that I am familiar with due to the fact that «mention» appears to be the English word. Peut-être, vous pourriez reformuler votre question. Bonne chance.

So it took me a few days to locate what you are referencing «Mention assez bien» This is a kwiziq response to a good result on a kwiz, Mention as in honorable mention but «assez bien» is translated as «good enough»