Hi Patricio,
You don’t need to answer the later-added quiz questions in order to see the new content. But you do need to complete the module exams if you’d like to see the new material. That’s not our call– it’s just one of the limitations of the learning management software we’re using to run the courses.
If you’d like to re-do all the quizzes, we can reset you to the beginning of whichever module you like. We’ve had many students and alumni opt to do this is a more thorough way of reviewing the material and taking in the new stuff. Let me know if you would like this– it’s no trouble at all to set this up for you.
Scott