public function get_attempts_by_quiz( $quiz_id, $args = array() ) {

		$args = wp_parse_args(
			array(
				'student_id' => $this->get_id(),
				'quiz_id'    => $quiz_id,
			),
			$args
		);

		$query = new LLMS_Query_Quiz_Attempt( $args );

		if ( $query->has_results() ) {
			return $query->get_attempts();
		}

		return array();

	}