A sighted user can quickly see that a quiz has three pages, and tell the length of each page by the size of the browser scroll bar or by quickly scrolling the page. From here they can guess or estimate the number of questions.
The best case for a blind user would be to read up the page from the bottom to determine that the last question is number ten; in my testing no user did this.
Why it matters
A 25-question quiz is a serious time investment for a blind user. Without notice at the beginning they have no way to estimate how long they'll need.
Start each quiz with a brief summary of its properties, e.g., "This quiz has 25 questions on 3 pages."