How do i hide Screen Options and Help Menu from the main dashboard?

Hi,

Thanks for the feedback.

To hide screen options link:

add_action( 'admin_head' , 'hide_screen_options');

function hide_screen_options() {

    if (current_user_can('administrator')) {
        return;
    }

    add_filter('screen_options_show_screen', '__return_false');
}
// end of hide_screen_options()

To hide ‘Help’ link try this:

function hide_help() {
    echo '<style type="text/css">
            #contextual-help-link-wrap { display: none !important; }
    </style>';
}
add_action('admin_head', 'hide_help');

I would like to remark that this approach can interfere with Ajax scripts from within the Dashboard. See, e.g. Ajax in Plugins.