JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap-theme.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<body>
     <h1>Exam Entry Form</h1>

    <form name="ExamEntry" method="post" action="success.html">
        <table width="50%" border="0">
            <tr>
                <td id="name">Name</td>
                <td>
                    <input type="text" name="name" />
                </td>
                <tr>
                    <td id="subject">Subject</td>
                    <td>
                        <input type="text" name="subject" />
                    </td>
                </tr>
                <tr>
                    <td id="examnumber">Examination Number</td>
                    <td>
                        <input type="text" name="examnumber" />
                    </td>
                </tr>
                <tr>
                    <td>
                        <input type="radio" id="GCSE" name="examtype" />: GCSE
                        <br />
                        <td>
                            <input type="radio" id="A2" name="examtype" />: A2
                            <br />
                            <td>
                                <input type="radio" id="AS" name="examtype" />: AS
                                <br />
                </tr>
                <tr>
                    <td>
                        <input type="submit" name="Submit" value="Submit" onclick="return validateForm();" />
                    </td>
                    <td>
                        <input type="reset" name="Reset" value="Reset" />
                    </td>
                </tr>
        </table>
    </form>
</body>

JavaScript

$(document).ready(function () {
    $('input[type="radio"]').on('click', function () {
        var r = confirm("Are you sure?");
        if (r == true) {
            $(this).prop('checked', true);
        } else {
            $(this).prop('checked', false);
        }
    });
});