post_total_score.php

<?php
global $wpdb;

$filters_hash = MRP_Multi_Rating_API::get_filters_hash( array() ); // if you want to add any Multi Rating pro specific filters e.g. rating_item_ids
	
$rating_form = MRP_Utils::get_rating_form( $post_id );
	
$query = 'SELECT SUM(adjusted_score_result) FROM ' . $wpdb->prefix 
		. MRP_Multi_Rating::RATING_RESULT_TBL_NAME  . ' rr WHERE rr.post_id = ' . $post_id .
		' AND rr.rating_form_id = ' . $rating_form_id . ' AND rr.filters_hash = "' . $filters_hash 
		. '" AND rr.rating_item_id IS NULL AND rr.rating_entry_id IS NOT NULL GROUP BY rr.post_id';
	
echo $wpdb->get_var( $query );