Export value is not calculating

There are a few sets of questions with drop down selections at the end of each question. Another table is set up at the very end to display percentages for each set of questions.

In the table at the end, each array is hidden and each array leads to a visible score field.

This is what each score field does. I'm thinking it doesn't work because my new form has different names for the fields (which I did enter into the script) or I need to do something else with the dropdown aspect:

var fieldsObj = [["Field1","Score1"], ["Field2","Score2"]];

for (var i in fieldsObj) {

    calcAll(fieldsObj[0], fieldsObj[1]);

}

function calcAll(FieldArrName, FieldScoreName) {

    var f = this.getField(FieldArrName);

    var a = f.getArray();

    var isNotNull = false;

    var termSum = 0;

    var calcDen = 0;

    for (var j=0; j<a.length; j++) {

        if (a.value != a.defaultValue) {

         isNotNull = true;

          termSum += a.value;

          calcDen++;

        }

    }

    var s = this.getField(FieldScoreName);

    if (isNotNull){

        s.value = 2* termSum/(calcDen*8);

    }

    else {

        s.value = "";

    }

}