C:/xampp/htdocs/moodle/question/behaviour/interactivecountback/behaviour.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die();

require_once(dirname(__FILE__) . '/../interactive/behaviour.php');


class qbehaviour_interactivecountback extends qbehaviour_interactive {
    const IS_ARCHETYPAL = false;

    public function is_compatible_question(question_definition $question) {
        return $question instanceof question_automatically_gradable_with_countback;
    }

    protected function adjust_fraction($fraction, question_attempt_pending_step $pendingstep) {
        $totaltries = $this->qa->get_step(0)->get_behaviour_var('_triesleft');

        $responses = array();
        $lastsave = array();
        foreach ($this->qa->get_step_iterator() as $step) {
            if ($step->has_behaviour_var('submit') &&
                    $step->get_state() != question_state::$invalid) {
                $responses[] = $step->get_qt_data();
                $lastsave = array();
            } else {
                $lastsave = $step->get_qt_data();
            }
        }
        $lastresponse = $pendingstep->get_qt_data();
        if (!empty($lastresponse)) {
            $responses[] = $lastresponse;
        } else if (!empty($lastsave)) {
            $responses[] = $lastsave;
        }

        return $this->question->compute_final_grade($responses, $totaltries);
    }
}