Hello Do Thanh,
Happy to help!
There isn't a way to modify the built-in quiz variables generated by Storyline 360. You'll either need to use a "Combined Results" slide to compute for the aggregate score, or send the value of the 'Total Score' variable manually to your LMS by following the instructions here:
Using a "Combined Results" slide will allow your quiz to collect all of the scores of each individual quiz and then compute for a total which can then be used to determine if a learner passes or not. You can check out this article to learn more about quizzing and tracking options in Storyline 360:
Let me know if you have any questions!
