Display only completed units and quizzes in curriculum

curriculum.php

<?php
/**
 * The template for displaying Course Curriculum
 *
 * Override this template by copying it to yourtheme/course/single/curriculum.php
 *
 * @author 		VibeThemes
 * @package 	vibe-course-module/templates
 * @version     1.8.2
 */


global $post;
$id= get_the_ID();

$class='';
$settings = get_option('lms_settings');
if(isset($settings['general']['curriculum_accordion']))
	$class="accordion";
?>

<div class="course_title">
	<h2><?php  _e('Course Curriculum','vibe'); ?></h2>
</div>

<div class="course_curriculum <?php echo $class; ?>">
<?php
do_action('wplms_course_curriculum_section',$id);
$course_curriculum = vibe_sanitize(get_post_meta($id,'vibe_course_curriculum',false));

if(isset($course_curriculum)){

	foreach($course_curriculum as $lesson){
		if(is_numeric($lesson)){
			$user_id = get_current_user_id();

			$check = get_user_meta($user_id,$lesson,true);
			if(isset($check) && is_numeric($check)){

			$icon = get_post_meta($lesson,'vibe_type',true);

			if(get_post_type($lesson) == 'quiz')
				$icon='task';

			$href=get_the_title($lesson);
			$free='';
			$free = get_post_meta($lesson,'vibe_free',true);

			$curriculum_course_link = apply_filters('wplms_curriculum_course_link',0);
			if(vibe_validate($free) || ($post->post_author == get_current_user_id()) || current_user_can('manage_options') || $curriculum_course_link){
				$href=apply_filters('wplms_course_curriculum_free_access','<a href="'.get_permalink($lesson).'?id='.get_the_ID().'">'.get_the_title($lesson).(vibe_validate($free)?'<span>'.__('FREE','vibe').'</span>':'').'</a>',$lesson,$free);
			}

			echo '<div class="course_lesson">
			<i class="icon-'.$icon.'"></i><h6>'.apply_filters('wplms_curriculum_course_lesson',$href,$lesson).'</h6>';
			$minutes=0;
			$hours=0;
			$min = get_post_meta($lesson,'vibe_duration',true);
			$minutes = $min;
			if($minutes){
				if($minutes > 60){ 
					$hours = intval($minutes/60);
					$minutes = $minutes - $hours*60;
				}
				echo apply_filters('wplms_curriculum_time_filter','<span><i class="icon-clock"></i> '.(isset($hours)?$hours.__(' Hours','vibe'):'').' '.$minutes.' '.__('minutes','vibe').'</span><b>'.((isset($hours) && $hours)?sprintf('%02d',$hours):"00").':'.sprintf('%02d', $minutes).'</b>',$min);
			}	
			echo '</div>';
			}
		}else{
			echo '<h5 class="course_section">'.$lesson.'</h5>';
		}
	}
}
	?>
</div>

<?php

?>