Extract 2024 JEE Mains Score from Answer Key Challenge

getAnswerKey.js

// to be run on the answer key challenge page after loggin into student dashboard (https://jeemain.ntaonline.in/*)
// updated as per new answer key scheme
let answerKey = {};
$$(".form-options-item").forEach(i => {
  let questionId = i.querySelector(".vcenter:nth-child(2)").innerHTML;
  let correct = i.querySelector(".vcenter:nth-child(3)").innerHTML;
  answerKey[questionId] = correct;
});
copy(answerKey);

getResults.js

// After getting answerKey from above script, this is to be pasted in the console of devtools (ctrl + shift + j) opened in your response sheet page (https://cdn3.digialm.com//per/*)
// updated as per new answer key scheme
let answerKey = {
  // define the answer key here
}

let name = $$(".main-info-pnl")[0].querySelector("tr:nth-child(2)>td:last-child").innerHTML;
let applicationNumber = $$(".main-info-pnl")[0].querySelector("tr:nth-child(1)>td:last-child").innerHTML;
let rollNumber = $$(".main-info-pnl")[0].querySelector("tr:nth-child(3)>td:last-child").innerHTML;
let testDate = $$(".main-info-pnl")[0].querySelector("tr:nth-child(4)>td:last-child").innerHTML;
let responses = {};
$$("table.menu-tbl").forEach(t => {
  let questionType = t.querySelector("tr:nth-child(1)>td.bold").innerHTML;
  let questionId = t.querySelector("tr:nth-child(2)>td.bold").innerHTML;
  let answer = "";
  if (questionType == "MCQ") {
    let choosenAns = t.querySelector(`tr:last-child>td.bold`).innerHTML.trim();
    if (choosenAns == "--") {
      responses[questionId] = null;
      return;
    };
    let choosenAnsId = t.querySelector(`tr:nth-child(${2 + parseInt(choosenAns)})>td.bold`).innerHTML.trim();
    answer = choosenAnsId;
  }
  else {
    answer = t.parentElement.querySelector("table").querySelector("tr:last-child>td.bold").innerHTML.trim();
    if (answer == "--") {
      responses[questionId] = null;
      return;
    }
  }
  responses[questionId] = answer;
})
function getResults(answerKey) {
  let score = 0;
  let total = Object.keys(answerKey).length;
  let correct = 0;
  let incorrect = 0;
  let unanswered = 0;
  let commomPart = parseInt(Object.keys(answerKey).reduce((a, b) => a < b ? a : b)) - 1;
  let subjectWiseScore = {
    physics: {
      score: 0,
      total: 30,
      correct: 0,
      incorrect: 0,
      unanswered: 0
    },
    chemistry: {
      score: 0,
      total: 30,
      correct: 0,
      incorrect: 0,
      unanswered: 0
    },
    mathematics: {
      score: 0,
      total: 30,
      correct: 0,
      incorrect: 0,
      unanswered: 0
    },
  }

  for (let questionId in answerKey) {
    let questionNumber = parseInt(questionId) - commomPart;
    let questionRows = $$(".rw");
    let currentQuestionRow = questionRows.filter(row => row.innerHTML.includes(questionId))[0];
    let menuBox = currentQuestionRow.querySelector(".menu-tbl");
    let correctAnswer = ""
    if (menuBox.innerHTML.includes("MCQ")) {
      let optionIds = [];
      for (let n = 3; n <= 6; n++) {
        optionIds.push(menuBox.querySelector(`tr:nth-child(${n})>td.bold`).innerHTML.trim());
      }
      correctAnswer = optionIds.indexOf(answerKey[questionId]) + 1;
    }
    else {
      correctAnswer = answerKey[questionId];
    }
    let tr = document.createElement("tr");

    tr.innerHTML = `<td align="right">Correct Option:</td><td class="bold">${correctAnswer}</td>`
    menuBox.querySelector("tbody").appendChild(tr);
    if (responses[questionId] == null) {
      unanswered++;
      if (questionNumber <= 30) {
        // maths
        subjectWiseScore.mathematics.unanswered++;
      }
      else if (questionNumber <= 60 && questionNumber > 30) {
        // physics
        subjectWiseScore.physics.unanswered++;
      }
      else {
        // chemistry
        subjectWiseScore.chemistry.unanswered++;
      }
    }
    else if ((answerKey[questionId].toString() == responses[questionId].toString()) || (answerKey[questionId].toString().toLowerCase() == "drop")) {
      correct++;
      currentQuestionRow.style.background = "#4ADE80";
      if (questionNumber <= 30) {
        // maths
        subjectWiseScore.mathematics.correct++;
      }
      else if (questionNumber <= 60 && questionNumber > 30) {
        // physics
        subjectWiseScore.physics.correct++;
      }
      else {
        // chemistry
        subjectWiseScore.chemistry.correct++;
      }
    }
    else {
      incorrect++;
      currentQuestionRow.style.background = "#F87171";
      if (questionNumber <= 30) {
        // maths
        subjectWiseScore.mathematics.incorrect++;
      }
      else if (questionNumber <= 60 && questionNumber > 30) {
        // physics
        subjectWiseScore.physics.incorrect++;
      }
      else {
        // chemistry
        subjectWiseScore.chemistry.incorrect++;
      }
    }
  }
  score = (correct * 4) + (unanswered * 0) + (incorrect * -1);
  subjectWiseScore.physics.score = (subjectWiseScore.physics.correct * 4) + (subjectWiseScore.physics.unanswered * 0) + (subjectWiseScore.physics.incorrect * -1);
  subjectWiseScore.chemistry.score = (subjectWiseScore.chemistry.correct * 4) + (subjectWiseScore.chemistry.unanswered * 0) + (subjectWiseScore.chemistry.incorrect * -1);
  subjectWiseScore.mathematics.score = (subjectWiseScore.mathematics.correct * 4) + (subjectWiseScore.mathematics.unanswered * 0) + (subjectWiseScore.mathematics.incorrect * -1);
  return {
    studentDetails: {
      name, applicationNumber, rollNumber, testDate
    },
    score,
    total,
    correct,
    incorrect,
    unanswered,
    subjectWiseScore,
  };
}
let results = getResults(answerKey);
console.log(results);
copy(results);