I applied back in July or so when I was miserable at my job (which is not in aviation) and was looking for a change. I finally was contacted about taking the exam in December, but by that time I decided that I was not interested in taking the exam anymore because what I really want to do is fly, not be a controller.
Sometimes the applications are only open to experienced controllers, but just keep checking every day and you'll find one that is open to the public.