For those who are interested in this modification, you can edit the complete.php file located in wp-content > themes > eduma > learnpress-v3 > content-quiz > buttons.
<?php
/**
* Template for displaying Complete button in quiz.
*
* This template can be overridden by copying it to yourtheme/learnpress/content-quiz/buttons/complete.php.
*
* @author ThimPress
* @package Learnpress/Templates
* @version 3.0.0
*/
/**
* Prevent loading this file directly
*/
defined( 'ABSPATH' ) || exit();
?>
<?php
$quiz = LP_Global::course_item_quiz();
/* start edit */
$current_question_id = $quiz->get_viewing_question( 'id' );
$next_id = $quiz->get_next_question($current_question_id);
/* finish edit */
?>
<?php/* start edit */?>
<?php if ( !$next_id ) { ?>
<?php/* finish edit */?>
<?php do_action( 'learn-press/quiz/before-complete-button' ); ?>
<form name="complete-quiz" class="complete-quiz form-button lp-form" method="post" enctype="multipart/form-data">
<?php do_action( 'learn-press/quiz/begin-complete-button' ); ?>
<button type="submit" class="button-finish-quiz"><?php _e( 'Complete', 'eduma' ); ?></button>
<?php do_action( 'learn-press/quiz/end-complete-button' ); ?>
<?php LP_Nonce_Helper::quiz_action( 'complete', $quiz->get_id(), get_the_ID() ); ?>
<input type="hidden" name="noajax" value="yes">
</form>
<?php do_action( 'learn-press/quiz/after-complete-button' ); ?>
<?php/* start edit */?>
<?php } ?>
<?php/* finish edit */?>