* @since 3.12.0
	 * @since 3.16.0 Unknown.
	 *
	 * @return int[] Array of WP_Post IDs of the quizzes.
	 */
	public function get_quizzes() {

		$quizzes = array();
		foreach ( $this->get_lessons( 'lessons' ) as $lesson ) {
			if ( $lesson->has_quiz() ) {
				$quizzes[] = $lesson->get( 'quiz' );
			}
		}
		return $quizzes;

	}

	/**
	 * Get course sections
	 *
	 * @since 3.0.0
	 * @since 3.24.0 Unknown.
	 *
	 * @param string $return Optional. Type of return [ids|posts|sections]. Default is 'sections'.
	 * @return int[]|WP_Post[]|LLMS_Section[] The type depends on value of `$return`.
	 */
	public function get_sections( $return = 'sections' ) {

		$q = new WP_Query(
			array(
				'meta_key'       => '_llms_order',
				'meta_query'     => array(