Таймер викторины Javascript

Привет, я делаю викторину, используя javascript, но не могу установить работающий таймер обратного отсчета. Это может быть простой вопрос, но как я могу сделать так, чтобы, как только таймер достигнет нуля, он отправил викторину и сообщил пользователю время? Я пробовал несколько разных способов, но безрезультатно. Любая помощь приветствуется.

Мой код для таймера обратного отсчета:

<script>

var total_seconds = 30*1;
var c_minutes = parseInt(total_seconds/60);
var c_seconds = parseInt(total_seconds%60);

function CheckTime(){
document.getElementById("quiz-time-left").innerHTML
= 'Time Left: ' + c_minutes + ' minutes ' + c_seconds + ' seconds ' ;

if (total_seconds <=0){
setTimeout('document.quiz.submit()',1);
} else {
total_seconds = total_seconds -1;
c_minutes = parseInt(total_seconds/60);
c_seconds = parseInt(total_seconds%60);
setTimeout("CheckTime()",1000);
}}
setTimeout("CheckTime()",1000);
</script> 

Мой код для викторины:

    <form name = "form" onsubmit = "return score()">
    <h3>1. How many yellow cards equal a red card in football?</h3>
    <input type = "radio" name = "q1" value = "a">a. 1<br>
    <input type = "radio" name = "q1" value = "b">b. 2<br>
    <input type = "radio" name = "q1" value = "c">c. 3<br>
    <input type = "radio" name = "q1" value = "d">d. 4<br>

    <form name = "form" onsubmit = "return score()">
    <h3>1. How many yellow cards equal a red card in football?</h3>
    <input type = "radio" name = "q2" value = "a">a. 1<br>
    <input type = "radio" name = "q2" value = "b">b. 2<br>
    <input type = "radio" name = "q2" value = "c">c. 3<br>
    <input type = "radio" name = "q2" value = "d">d. 4<br>

    <form name = "form" onsubmit = "return score()">
    <h3>1. How many yellow cards equal a red card in football?</h3>
    <input type = "radio" name = "q3" value = "a">a. 1<br>
    <input type = "radio" name = "q3" value = "b">b. 2<br>
    <input type = "radio" name = "q3" value = "c">c. 3<br>
    <input type = "radio" name = "q3" value = "d">d. 4<br>
    <br>
    <input type = "submit" id = "sendA" value = "Submit">
    <br>
    <p id = "p"></p>

</form>

</html>

<script> 

function score()
{
    //Referencing the value of the questions
    var q1 = document.forms.form.q1.value;
    var q2 = document.forms.form.q2.value;
    var q3 = document.forms.form.q3.value;

    //Array for the questions
    var questions = [q1, q2, q3];

    //Answers for each question
    var answers = ["b", "b", "b"];

    //variable to keep track of the points
    var points = 0;
    var total = 3;
    //max score 

    //Making use of a for loop to iterate over the questions and answers arrays
    for (var i = 0; i < total; i++)
    {
    if (questions[i] == answers[i]) {
            points = points + 1; //Increment the score by 2 for every correct answer given
        }
    }

    //CSS for questions
    var q = document.getElementById("p");

    q.style.fontSize = "40px";
    q.style.textAlign = "center";
    q.innerHTML = "You got " + points + " out of " + total;

    return false;
}

    </script>