@Superfly
Out of all the people called a few don't end up paying the $375 for the exam in which case some more people are contacted for the exam. So there still lies hope.
As for this being the last session, from what I understand this process is an ongoing process and may become a lot less frequent and number of people getting selected may drop but then that doesn't mean the process on the whole will stop.
The best you can do is prepare well and make sure you nail the opportunity as and when it arrives. Good luck
