How to add js file to plugin

I created my own plugin and i attached the css file and its working fine and i attached jquery and it is not working. In jquery file i am just giving the alert message only.

This is my code:

add_action(‘wp_enqueue_scripts’, ‘add_to_head’);
function add_to_head()
{

//Adding plugin script to head
wp_deregister_script( ‘jquery’ );
wp_register_script(‘jquery’, ‘https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js’);
wp_enqueue_script(‘jquery’);
wp_register_script(‘myscript’, plugins_url(‘css/script.js’, __FILE__), array(‘jquery’), ‘1.0’, true );
wp_enqueue_script(‘myscript’);

//Adding plugin stylesheet to head
$src = plugins_url(‘css/style.css’, __FILE__);
wp_register_style(‘style’, $src);
wp_enqueue_style(‘style’);

}

Jquery Code:

$j=jQuery.noConflict();

// Use jQuery via $j(…)
$j(document).ready(function($){
alert(‘test’);
});