2 schools + extra key

$meta_query = array(
	'relation' => 'AND',
	array(
		'relation' => 'OR',
		array(
			'key'     => 'school',
			'value'   => '333',
			'compare' => '=',
		),
		array(
			'key'     => 'additional_schools',
			'value'   => '444',
			'compare' => '=',
		),
	),
	array(
		'key'     => 'next_generation_short_tiger_2022',
		'value'   => '1',
		'compare' => '=',
	),
);