Did you took all the trainings?
-Clearpass Essentials
-Virtual Labs
-Clearpass advance deployment workshop
Wtih all those training it should be enough to pass...
Im on the same boat as you are but im aiming for the ACCA, which it seems it will be a new certification for clearpass.
There is a traning on the airheads conference that prepares you for that and they also give you a voucher for the exam
After getting the ACCA, ill get the ACCP.
Cheers
Carlos