I'm thinking of doing OCP for 9i. But I can't understand one point. They say that 4 exams are required for OCP 9i. By clearing first 2, one can get OCA certificate. To get OCP, one has to clear other 2 exams and a mandatory training course from Oracle! I wonder what is course and why it is mandatory? How much does it cost?

I have seen a few websites, but none really explains about this mandatory training!

Any help?