Before Q3 you can use survey flow to do branch logic i.e. first assign embedded data score  = 10 then check if number entered and display are not equal in branch logic, if yes the using Math Operation do the subtraction and update the embedded data score to the math operation result. 

I’m unable to fetch SelectedNumber and PointsScored.

Could you help? Here’s my survey preview.

https://illinois.qualtrics.com/jfe/preview/previewId/8eb0851a-85b0-41e1-89b0-883173619dbc/SV_1zEi7ArtY82x5rw?Q_CHL=preview&Q_SurveyVersionID=current

I completed it! I had to change the code to
 

Qualtrics.SurveyEngine.addOnload(function()
{
// Fetch the random number generated from Embedded Data
var randomNumber = parseInt("${e://Field/RandomNumber}");

console.log('Random Number:', randomNumber);

function calculateScore(randomNumber, selectedNumber) {
    if (randomNumber === selectedNumber) {
        return 10;  // If the random number is equal to the selected number, assign a score of 10
    } else {
        return 10 - Math.abs(randomNumber - selectedNumber);  // Calculate the score based on the difference
    }
}

// Trigger the calculation when the participant selects an answer
jQuery('#QID1 input').change(function() {
    // Parse the selected number
    var selectedNumber = parseInt(jQuery(this).val());
    selectedNumber = selectedNumber - 6;

    // Calculate the score
    var score = calculateScore(randomNumber, selectedNumber);
    
    // Set the score as embedded data
    Qualtrics.SurveyEngine.setEmbeddedData('score', score);

    // Log the results
    console.log('Selected Number:', selectedNumber);
    console.log('Calculated Score:', score);
});

});

Qualtrics.SurveyEngine.addOnReady(function()
{
    /*Place your JavaScript here to run when the page is fully displayed*/

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
    /*Place your JavaScript here to run when the page is unloaded*/

});