Check out my Game of Thrones Themed Quiz! (Spoilers)

/*
    A Song of Fire and Ice Quiz
*/

// Answers for Questions


var answer1 = 'NED STARK';
var answer2 = 'CASTERLY ROCK';
var answer3 = 'BRAAVOS';
var answer4 = 'ROOSE BOLTON';
var answer5 = 'LADY STONEHEART';

// Score Counter
var counter = 0;

// 5 Questions
var question1 = prompt('Who is the father of Robb Stark');
    if (question1.toUpperCase() === answer1) {
    counter += 1;
    alert("Good Job, you got that one right.");
    } else {
    alert("I'm afraid Ned Stark is Robb's father.");
    }

var question2 = prompt('Where is the seat of House Lannister');
    if (question2.toUpperCase() === answer2) {
    counter += 1;
    alert("Nice one, that was correct");
    } else {
    alert("Not quite, the Lannisters are seated at Casterly Rock.");
    }

var question3 = prompt('Where is Arya training to become a Faceless Man?');
    if (question3.toUpperCase() === answer3) {
    counter += 1;
    alert("Awesome, that was the right answer.");
    } else {
    alert("Wrong, Arya is training with Jaqen in Braavos.");
    }

var question4 = prompt('Who fatally stabbed Robb Stark at the Twins?');
    if (question4.toUpperCase() === answer4) {
    counter += 1;
    alert("Sweet, only one more question to go.");
    } else {
    alert("Unfortunately, Roose Bolton dealt the heartbreaking blow.");
    }

var question5 = prompt('Catelyn Tully takes on an alias after the Red Wedding, what is it?');
    if (question5.toUpperCase() === answer5) {
    counter += 1;
    alert("Perfect, that was correct. Let's see your final score.");
    } else {
    alert("After being resurrected, Catelyn travles with the BwB under the name Lady Stoneheart");
    }

// Post-game score analysis

    document.write("<h2>Your final score is " + counter + ".</h2>");

    if (counter === 5) {
    document.write("<p>Nice job, you for the top score!</p>");
    } else if (counter => 3) {
    document.write("<p>Not bad, not quite top score</p>");
    } else if (counter => 1) {
    document.write("<p>Not good, read more!</p>");
    } else {
    document.write("<p>You got none right.</p>");
    }