hospice RN certification - Page 3

I was certified back in the mid-90s. Then I changed specialties and didn't rectify. Now I'm in oncology and recently got my OCN. I'm considering taking the CHPN in March, got the study guides. I took the practice test and got 46/50. Anybody have any suggestions for study (equianalgesic doses, for sure) for what to study and what my chances are? I remember it being a difficult test back when I took it (you were a CRNH if you passed).