Hi emad,
I won't say the the american licensure study materials are worthless. I just think for some candidates, it may not be sufficient to give the full picture of what the PCE requires. Unfortunately, there are no Canadian specific study materials and practice exam books like the O'Sullivan NPTE book, Score builders etc so we are still limited to using these for now.
What books did I use:
1) O'Sulllivan Big Red "Physical Rehabilitation" Book.
2) McGee's Clinical Orthopedics
3) Kisner's Therapeutic Exercise
4) Pathology: Implication for Physical Therapist
Hope this helps