public static function get_sorted_subjects() {
        $subjects = get_string_manager()->load_component_strings('edufields', current_language());

        // Sort the subjects.
        $return  = [];
        asort($subjects);
        foreach ($subjects as $key => $option) {
            $keylength = strlen($key);
            if ($keylength == 12) {
                $return[$key] = $option; // We want only selectable categories.
            }
        }
        return $return;
    }