Each multiple-choice quiz question contains text like this: "Marks: --/1"

Why it matters

To a sighted user this likely means, "You've not yet received a score for this question, and one point is possible." A screen reader user hears, "Marks colon dash dash slash one." This is difficult to understand.

Possible solution

If a question has not been attempted, do not show this text. If a question has been attempted, explicitly state the result: "Marks received: 1 of a possible 1."