Here's my attempt!

var correctCount = 0; // number of questions the user has answered correctly
var response; // user response;
var correctAnswers = []; // the questions that have been answered correctly 
var wrongAnswers = []; // the questions the have been answered incorrectly
var questions = [
  ['Which coast is New York on?', 'East'],
  ['Which coast is LA on?', 'West'],
  ['Which coast is Seattle on?', 'West']
];

function print(message) {
  document.write(message);
}

for ( var i = 0; i < questions.length; i += 1 ) {
  response = prompt(questions[i][0]);
  answer = questions[i][1];
    if ( response.toLowerCase() === answer.toLowerCase() ) {
      correctCount += 1;
      correctAnswers.push(questions[i][0]);
    } else {
      wrongAnswers.push(questions[i][0]);
    }
}

html = 'You got ' + correctCount + '/3 questions right.';

if (correctCount > 0) {
   html += '<h2>You got these questions correct:</h2><ol><li>' + correctAnswers.join("</li><li>") + '</li></ol>'; 
} 
else {
     html += '<h2>You didnt get any questions correct.</h2>';
}

if (correctCount < questions.length) {
    html += '<h2>You got these questions wrong:</h2><ol><li>' + wrongAnswers.join("</li><li>") + '</li></ol>'; 
}
else {
    html +='<h2>You didnt get any questions wrong.</h2>';
}

print(html);