I did the Foundation and regretted not doing the Practitioner (my old company wouldn't pay the difference). Format is that you all study as a group, sit the foundation multi choice exam at the end of Wednesday and have to pass that to do practitioner... the foundation is pretty straight forward if you've done the pre read, sat and understood the course and have a bit of PM experience you'll be fine. If you fail, they can make provision for a re-sit and the invigilator stays around for you to have another bash there and then.
When I did my course, there were 12 people attending. At the end of Weds the 2 of us who had not booked the practitioner left and the rest stayed on. The course leader said it's a real shame that you are off since the training is the same for all and on the Thursday it was just about working through some case studies, doing some exam prep and doing the 'big' exam Friday morning...
So annoyingly I had been as trained up as far as I needed to be in order to sit the practitioner exam but didn't... In hindsight I should have booked a couple of days leave and paid the few hundred quid extra myself.
Moral of this is that if you are sitting through the training to get you through the foundation at the end of Day 3, it would be daft to not do day 4 and then the exam on day 5 too.
Best of luck with it and don't forget to read up in advance and each night - a residential course is best for this.
