Edited: Jan 21, 2019
You can add quizzes to your site by adding the HTML code using the HTML code element. You can also search the Wix App Market for suitable third-party apps.
You can create your own quizzes with forms and Wix Code. See these examples for making your own forms:
Create a basic form without writing a line of code. Use input elements, a dataset, and a button to capture and store user input in a database collection.
Collapse and expand sections of a form.
Split a form into multiple stages using a slideshow.
Use the forms for the user to enter in their quiz answers, and then provide the code needed to determine success. You can add a database collection to hold quiz questions and answers, and another collection to store the results of the users.
With Wix Code the sky is the limit.l