public function get_progress( $object_id, $type = 'course', $use_cache = true ) {

		$ret       = 0;
		$cache_key = sprintf( '%1$s_%2$d_progress', $type, $object_id );
		$cached    = $use_cache ? $this->get( $cache_key ) : '';

		if ( '' === $cached ) {

			$total     = 0;
			$completed = 0;

			if ( 'course' === $type ) {

				$course  = new LLMS_Course( $object_id );
				$lessons = $course->get_lessons( 'ids' );
				$total   = count( $lessons );
				foreach ( $lessons as $lesson ) {
					if ( $this->is_complete( $lesson, 'lesson' ) ) {
						$completed++;
					}
				}
			} elseif ( 'course_track' === $type ) {

				$track   = new LLMS_Track( $object_id );
				$courses = $track->get_courses();
				$total   = count( $courses );
				foreach ( $courses as $course ) {
					if ( $this->is_complete( $course->ID, 'course' ) ) {
						$completed++;
					}
				}
			} elseif ( 'section' === $type ) {

				$section = new LLMS_Section( $object_id );
				$lessons = $section->get_lessons( 'ids' );
				$total   = count( $lessons );
				foreach ( $lessons as $lesson ) {
					if ( $this->is_complete( $lesson, 'lesson' ) ) {
						$completed++;
					}
				}
			}

			$ret = ( ! $completed || ! $total ) ? 0 : round( 100 / ( $total / $completed ), 2 );
			$this->set( $cache_key, $ret );

		} else {
			$ret = $cached;
		}// End if().

		/**
		 * @filter llms_student_get_progress
		 * Filters the return of get_progress method
		 * @param    float   $ret        student's progress
		 * @param    int     $object_id  WP_Post ID of the object
		 * @param    string  $type       object post type [course|course_track|section]
		 * @param    int     $user_id    WP_User ID of the student
		 * @since    unknown
		 * @version  3.24.0
		 */
		return apply_filters( 'llms_student_get_progress', $ret, $object_id, $type, $this->get_id() );

	}