How to Pass External Variables to Filters/Actions

<?php
$score = 0;
$questions = get_quiz_result_questions();
$total_questions = 0;
foreach( $questions as $question ) {
    $order = $question->order;

    if( $order >= 100 ) {
        break;
    }

    if( $question->correct == $_POST['Q'][$order] ) {
        $score++;
    }
    $total_questions++;
}

global $wp;

global $score;
$wp->vars_for_filter = array($score, $total_questions);

function add_score_to_title($title) {
    global $wp;
    $score = $wp->vars_for_filter[0];
    $total_questions = $wp->vars_for_filter[1];
    return 'Quiz Results (' . $score . '/' . $total_questions . ') - ' . $title;
}

add_filter( 'aioseop_title_single', 'add_score_to_title');
get_header();
?>
<div id="content" class="quiz-results wide">
<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
    <h1><?php the_title(); ?> Results</h1>
    <p>Score: <?=$score?> out of <?=$total_questions;?></p>
    <table>
    <thead>
        <tr>
            <th class="question">Question</th>
            <th class="your-answer">You Said</th>
            <th class="correct-answer">Correct Answer</th>
        </tr>
    </thead>
    <tbody>
<?php
    foreach( $questions as $question ) {
    $order = $question->order;

    if( $order >= 100 ) {
        break;
    }

    if( $question->correct == $_POST['Q'][$order] ) {
        $class='correct';
    } else {
        $class='wrong';
    }

    $your_answer = $question->answers[$_POST['Q'][$order] - 1];
    $correct_answer = $question->answers[$question->correct - 1];
    ?>
    <tr>
        <td class="question"><strong><?=$order;?></strong> <?=$question->question;?></td>
        <td class="your-answer <?=$class;?>"><?=$your_answer;?></td>
        <td class="correct-answer"><?=$correct_answer;?></td>
    </tr>
    <?php
}
?>
     </tbody>

    </table>
<?php endwhile; endif; ?>
</div>
<?php get_footer(); ?>