google form auto filling script

extractor.js

// extractor works after submitting form and clicking on [View Score] button
// once all correct answers are displayed use this script

function isCorrect(el) {
        const val = el.querySelector('[aria-label="Incorrect"]')
        return val ? false:true
}

function answerFromIncorrect(el) {
        return el.querySelector("div.freebirdFormviewerViewItemsItemGradingCorrectAnswerBoxContent > div > label > div > div.docssharedWizToggleLabeledContent > div > span").innerText.split('.')[0]
}

function answerFromCorrect(el) {
        return el.getElementsByClassName('appsMaterialWizToggleRadiogroupEl exportToggleEl isChecked isDisabled')[0].getAttribute('data-value').split('.')[0]
}

var arr = Array.from(document.querySelectorAll("body > div > div:nth-child(2) > div.freebirdFormviewerViewFormCard.exportFormCard > div > div.freebirdFormviewerViewItemList > div"))
var questions = arr.slice(7)
var answers = []
for (let i=0; i<questions.length; i++) {
        if(isCorrect(questions[i])) {
                const answer = answerFromCorrect(questions[i])
                answers.push({ i: answer })
        } else {
                const answer = answerFromIncorrect(questions[i])
                answers.push({ i: answer })
        }
}
console.log(answers)

googleform.js

function getIntFromMCQ(optionStr) {
        const OptEnum = { 'A': 0, 'B': 1, 'C': 2, 'D': 3 }
        return OptEnum[optionStr]
} 

function autofillAnswers(answerSeriesStr) {
        let answers = answerSeriesStr.match(/\w/gm)

        for (let i=0; i<answers.length; i++) {
                let currQues = i
                let answer = answers[i]
                document.querySelectorAll('.freebirdFormviewerViewItemsItemItem')[currQues].children[1].children[0].children[0].children[0].children[getIntFromMCQ(answer)].querySelector('label').click()
        }
}

// usage autofillAnswers("DBCCBDBCADCBADBADABC")

singlePage.js

// change slice according to your need
myarr = Array.from(document.querySelectorAll("#mG61Hd > div.freebirdFormviewerViewFormCard.exportFormCard > div > div.freebirdFormviewerViewItemList > div")).slice(7)

function getIntFromMCQ(optionStr) {
        const OptEnum = { 'A': 0, 'B': 1, 'C': 2, 'D': 3 }
        return OptEnum[optionStr]
} 

function autoFillAnswers(answerStr) {
        const ans = answerStr.split('')
        for (let i=0; i<ans.length; i++) {
                myarr[i].children[0].children[0].children[1].children[1].querySelectorAll('label')[getIntFromMCQ(ans[i])].click()
        }
}