Some good sensible input above. Maybe a total 6 month application hold would be more sensible to all that fell at any stage. Would benefit all involved both candidates and BA itself. If you were good enough to be selected for assessment from your application you are interesting to them, if you pass the day one tests you tick that box, if you pass day two you display the personnel qualities they are looking for, the sim goes either way on the day, bad day, nerves etc. so to see these people again ASAP could be a better and easier way. After all you are the same person when it comes to tests, interviews and group exercises. I'm not saying guys should jump stages but at least be able to reapply when the position becomes open, how you perform again is based on your own merit.
And yes it's been 6 months for me but not 12 lol ; )
I think the system of selection is fair and well run, all be it hard work but the 12 month ban on reapplication could be changed.
Roll on September!