Load script only on selected Pages

You can use conditional tag such as is_page(). Register your script on hook wp_enqueue_scripts and enqueue it in if statement :

   wp_register_script('myashdrop',
    get_template_directory_uri() . '/js/dropdown.jquery.min.js',
    array('jquery'));

if (is_page(PAGEID)) { wp_enqueue_script('myashdrop'); }

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