Remove unwanted widget from wordpress dashboard

Edit the function.php file as follows and make available only ones that you need them to be displayed on your dashboard.

function remove_dashboard_widgets() {
//Plugins - Popular, New and Recently updated WordPress Plugins
remove_meta_box('dashboard_plugins', 'dashboard', 'normal');
//Wordpress Development Blog Feed
remove_meta_box('dashboard_primary', 'dashboard', 'side');
//Other WordPress News Feed
remove_meta_box('dashboard_secondary', 'dashboard', 'side');
//Right Now - Comments, Posts, Pages at a glance
remove_meta_box('dashboard_right_now', 'dashboard', 'normal');
//Recent Comments
remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');
//Incoming Links
remove_meta_box('dashboard_incoming_links', 'dashboard', 'normal');
//Quick Press Form
remove_meta_box('dashboard_quick_press', 'dashboard', 'side');
//Recent Drafts List
remove_meta_box('dashboard_recent_drafts', 'dashboard', 'side');
}
add_action('wp_dashboard_setup', 'remove_dashboard_widgets' );