Add this code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Dessky Snippets plugin. Please don’t add custom code directly to your parent theme’s functions.php file as this will be overwritten completely when you update the theme.

Use the following snippet to change the tab order.

/**
 * Reorder product data tabs
 */
add_filter( 'woocommerce_product_tabs', 'woo_reorder_tabs', 98 );
function woo_reorder_tabs( $tabs ) {

	$tabs['reviews']['priority'] = 5;			// Reviews first
	$tabs['description']['priority'] = 10;			// Description second
	$tabs['additional_information']['priority'] = 15;	// Additional information third

	return $tabs;
}