Partial points Quizz storyline

Hello, 

I am trying to build a quiz in storyline but partials points aren't supported.

My logic for assigning points is: 

•  If a wrong answer is selected, points for that question = 0 
• Incomplete answer: partials points according to the weight of that question

I did a custom JavaScript to allow this. I had to create custom variables to do so. 

However, after my code calculate the total score, I can't set the storyline Quiz.Score to my custom variables. I set some triggers on the slider master but it doesn't update to my custom variable. 

It is important for me to have the Storyline Quiz.score updated so that later in my LMS I can automatically have the learner's grade

Any suggestions?

Here my triggers in the slide master

 

 

Here my JS code: 

Custom variable created in storyline are "totalScore" and "totalScorePercent"

var player = GetPlayer();
// =============== CONFIGURATION ===============
var checkboxVars = ["q12_checkbox1", "q12_checkbox2", "q12_checkbox3"]; 
var correctAnswers = ["q12_checkbox1", "q12_checkbox2"];
var wrongAnswerVar = "q12_wrong"; // Boolean variable to track wrong answer
var questionWeight = 2;
var totalScoreVar = "totalScore";
var percentScoreVar = "totalScorePercent";
var maxScore = 34;
// =============================================

// STEP 1: Check if wrong answer flag is set
var wrongAnswerFlag = player.GetVar(wrongAnswerVar);

// STEP 2: Calculate score
var Q_score = 0;

if (wrongAnswerFlag) {
  // Wrong answer detected -> points = 0
  Q_score = 0;
} else {
  // No wrong answer -> apply partial points logic
  // Read checkbox selections
  var selected = {};
  checkboxVars.forEach(function(cb) {
    selected[cb] = player.GetVar(cb);
  });
  
  // Count correct answers selected
  var correctSelected = correctAnswers.filter(function(cb) {
    return selected[cb];
  }).length;
  
  var totalCorrect = correctAnswers.length;
  
  if (correctSelected === totalCorrect) {
    // All correct answers -> full points
    Q_score = questionWeight;
  } else if (correctSelected > 0) {
    // Partial points: (correct selected / total correct) * question weight
    Q_score = (correctSelected / totalCorrect) * questionWeight;
    // Round to 2 decimal places to handle 0.33, 0.66 etc.
    Q_score = Math.round(Q_score * 100) / 100;
  } else {
    // No correct answers selected
    Q_score = 0;
  }
}

// STEP 3: Update total score
var totalScore = player.GetVar(totalScoreVar) || 0;
totalScore += Q_score;
player.SetVar(totalScoreVar, totalScore);

// STEP 4: Update total percent
var percent = (totalScore / maxScore) * 100;
if (percent > 100) percent = 100;
player.SetVar(percentScoreVar, Math.round(percent));