We had some work done on our previous guru setup when we were using Joomla 4 and Guru pro 6.
https://www.joomlart.com/forums/d/42172-quiz-displaying-correct-answer-if-students-answer-is-incorrect/10

Now, we have since migrated to Joomla 4 and Guru Pro 6.1.3

I sent a message on the previous ticket to manhta , but not sure he received my message as it has been a 5 days and still no response.

I explained the issue on the ticket mentioned above, as we decided to keep this ticket open as it was a special tasks that the magical Manhta helped us with and was hoping someone can look into this, please.

As we've have several students over the past week since we migrated complaining about this and love to retain our good user experience.

Below is a quick illustration of what is going on:
https://app.screencast.com/qtJMjT0KzeCk0

I replaced the files

student_quizdetails.php
gurutask.php

as mentioned in both and renamed the previous one with an ending them with (-6.1.3) for reference purpose only.
And changed them out here:

root/components/com_guru/views/guruauthor/tmpl
root/components/com_guru/models

Unfortunately, after a student takes the quiz and wishes to retake the page is blank.

I have placed our current FTP access up top if you like to get in and review further, along with our backend admin access

Also, so you can view the actual quiz and test yourself.
Allow me to place the steps to see and test a quiz in the front-end;

1) log in with user credentials above on this ticket
2) visit mycourses page (https://website.com/mycourses)
3) quick watch to see where the quiz is exactly: https://app.screencast.com/aY6C0xuBHEYuG
4) find keywords for quiz: "Agree/Disagree No.1-No.5"
5) click retest/rejoin to attempt to retest the quiz

Please let me know, if you need anything else..
Thank you in advance.