Disable autoresponder based on quiz results

<?php
// http://www.gravityhelp.com/forums/topic/user-notification-email-upon-successful-quiz#post-172441
add_action('gform_pre_submission_filter_289', 'quiz_certificate');
function quiz_certificate($form) {
    // you will have to set $passed to true or false here based on whatever criteria you use for grading
    // lots
    // of
    // code
    // here
    if ( $passed == true ) {
        // this will send the autoresponder which is already set up
        return $form;
    }
    else {
        // clear out any autoresponder values
        $form['autoResponder'] = array(
            'toField' => '',
            'bcc' => '',
            'fromName' => '',
            'from' => '',
            'replyTo' => '',
            'subject' => '',
            'message' => '',
            'disableAutoformat' => '');
        return $form;
    }
}