[jQuery] Control form submitting

[jQuery] Control form submitting

<div dir="ltr">Hi all, is there some way how to control form submittin within succes or error calback functions within beforeSubmit callback function?
In my my code I validate form data at client side, when form is valid I send data to server by callback function beforeSubmit.
Server does another validation and return response. By this response I need to decide whether to submit or do not submit. But then (I guess) I cannot control return value by beforeSubmit function.
$(document).ready(function() {
  var v = jQuery("#registration").validate({
            submitHandler: function(form) {
                jQuery(form).ajaxSubmit({
                  url:  '/registration/form/',                   
                success: function(response) {
                // user has been registered
              },
              beforeSubmit: function(formData) {
                $.ajax({
              type: "POST",
              url: "/registration/check/",
              data: formData,
              processData: true,           
              success: function(response){
                // process response
              },
              error: function(){
                // some error occured               
              }           
            });                                
              }       
                });
            }
        });
});
</div>