Hi!
The following menu structure is created:

Root Category of Quiz /
Child category 1
Child category 2
Child category 3

All menu items display quizzes of the corresponding categories (In the root category all quizzes are displayed).

The following URLs are fomented for quizzes:

1. In the root menu item:

Root Category of Quiz/1-Quiz
Root Category of Quiz/2-Quiz
Root Category of Quiz/3-Quiz etc...

2. In the child menu items:

Root Category of Quiz/Child category 1/1-Quiz
Root Category of Quiz/Child category 2/2-Quiz
Root Category of Quiz/Child category 3/3-Quiz


Root Category of Quiz/1-Quiz and Root Category of Quiz/Child category 1/1-Quiz is a duplicate of one and the same page.

It's obvious that you need to edit the router or add a canonical tag.

How to solve this problem?