//Get Services and save to database first.
for($i = 0; $i < count($_POST["wc_service_id"]); $i++) {
    $wc_service_id          = $_POST["wc_service_id"][$i];
    $wc_service_name        = $_POST["wc_service_name"][$i];

    $wc_service_code        = $_POST["wc_service_code"][$i];
    $wc_service_qty         = $_POST["wc_service_qty"][$i];
    $wc_service_price       = $_POST["wc_service_price"][$i];

    $insert_query =  "INSERT INTO `".$computer_repair_items."` VALUES(NULL, '".$wc_service_name."', 'services', '".$post_id."')";
     $wpdb->query(
            $wpdb->prepare($insert_query)
    );
    $order_item_id = $wpdb->insert_id;


    $insert_query =  "INSERT INTO `".$computer_repair_items_meta."` 
                        VALUES(NULL, '".$order_item_id."', 'wc_service_code', '".$wc_service_code."'), 
                        (NULL, '".$order_item_id."', 'wc_service_id', '".$wc_service_id."'),
                        (NULL, '".$order_item_id."', 'wc_service_qty', '".$wc_service_qty."'), 
                        (NULL, '".$order_item_id."', 'wc_service_price', '".$wc_service_price."')";
    $wpdb->query(
            $wpdb->prepare($insert_query)
    );
}//Services Processed nicely

With code above its working completely fine only problem i am getting this Notice: when debug mode is on. And i shouldn’t have any notices.

Notice: wpdb::prepare was called incorrectly. The query argument of wpdb::prepare() must have a placeholder.

Is there any suggestion? I know removing prepare( would take away the problem. But i want to keep the query prepared if you think its not necessary please explain.

Also adding %s, %d for first query, is good. But what for 2nd Query where i have 3 values?

Thanks in advance for reply.