As I said - alot of people left before taking the test even though they were nearly ready; there could have been at least another four people to take the flight exam in that period.
I can't say what the pass rate is outside of that period because I don't know it, but I think that was a bit of a bobble. To be honest, the CPL course at OBA back in Feb - April was a bit of a fiasco, they didn't seem to turn students away, and there were six of us to two instructors. They were very good, but there were only two of them, which was then made worse with the fact that one was off over the weekend, and one had to work the desk! This, combined with strong winds over the period did not exactly give the best environment for a two week CPL. It took me five weeks to get to my initial flight test (and I was one of the ones who helped drag that first time pass rate down! <weepage>
Thankfully no such problems with the IR!)
Just make sure there aren't too many students before you go!