[Modify/Add] Improved practice exam layout and turned it into an interactive test experience.

assets/js/exam.js

@@ -0,0 +1,55 @@
+document.addEventListener('DOMContentLoaded', () => {
+  // Dynamically add checkboxes to the list items
+  document.querySelectorAll('ol > li').forEach((question, index) => {
+    const options = question.querySelectorAll('ul li');
+    options.forEach(option => {
+      const optionText = option.textContent.trim();
+      if (/^[A-Z]\.\s/.test(optionText)) {
+        const checkbox = document.createElement('input');
+        checkbox.type = 'checkbox';
+        checkbox.name = `question-${index}`; // Unique identifier for each question
+        checkbox.value = optionText.charAt(0); // Use the letter as the value
+        option.prepend(checkbox);
+      }
+    });
+  });
+});
+
+function submitQuiz() {
+  let score = 0;
+  let totalQuestions = 0;
+
+  document.querySelectorAll('ol > li').forEach((question, index) => {
+    const correctAnswerText = question.querySelector('details p').textContent.match(/Correct answer:\s([A-Z, ]+)/i);
+    if (!correctAnswerText) return; // Skip if no correct answers are found
+
+    const correctAnswers = correctAnswerText[1]
+      .replace(/\s+/g, '') // Remove spaces
+      .split(/,|(?=[A-Z])/); // Split on commas or consecutive uppercase letters
+
+    const selectedOptions = Array.from(
+      document.querySelectorAll(`input[name="question-${index}"]:checked`)
+    ).map(input => input.value);
+
+    if (correctAnswers.length > 0) {
+      totalQuestions++;
+    }
+
+    const isCorrect =
+      selectedOptions.length === correctAnswers.length &&
+      correctAnswers.every(answer => selectedOptions.includes(answer));
+
+    if (isCorrect) {
+      score++;
+      question.classList.remove('incorrect'); // Remove incorrect class if correct
+    } else {
+      question.classList.add('incorrect'); // Highlight incorrect questions
+    }
+  });
+
+  const percentage = totalQuestions > 0 ? ((score / totalQuestions) * 100).toFixed(2) : 0;
+
+  document.getElementById('score').innerText = `${score} / ${totalQuestions}`;
+  document.getElementById('percentage').innerText = percentage;
+  document.getElementById('result').style.display = 'block';
+}