Don't give out any personal information, they'll hound you with promotional material otherwise. They are incredibly convincing, they have been trained - through the study materials, to focus 100% on your body language, grab hold of any negative emotion that you could show and they can read you like a book.
When recruiting they have been known to search through your records, credit history etc. They want to know how much money you can hand over to them through courses.
So if you do decide to go along, don't hang along any longer than their 30 minutes of testing...they try to grab hold of you, they may ask you to stay for an orientation presentation...
In short, come back alive
