$args = array(
'post_type' => 'page',
'posts_per_page' => -1,
'meta_query' => array(
array(
'key' => '_wp_page_template',
'value' => 'page_list_R_ea_modelling_instructor_led.php' // Template file name
)
)
);
$the_pages = new WP_Query( $args );
echo "<pre>";print_r($the_pages->posts);exit;