Custom Form Data save after Login User

Just inspect the $_POST values on your login page.

add_action( 'login_head', 'wpse_98289_custom_form' );
function wpse_98289_custom_form()
{
    var_dump( $_POST );
}

You can there search for the values that you assigned as name/id attributes and then start populating your custom/additional fields in your login form.

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