if you don't try you don't get!!!
giving up at the first hurdle is not the sort of quality that these companies want.
also shows them that you really really really want to work for them.
msg to all cadets.... phone them, email them hassle them (nicely) and tell them you want to be part of it. Better still call in and say hello. After all they are only human like you and i.
what have you got to lose?