PCCN Review Information Needed Please

I have read many threads regarding PCCN preparation. I was hoping to start studying for the exam to possibly test in about 3 months. Many people have recommended different study material. I was wondering, since most of those postings were in the past and most of you have probably tested by now, if you could enlighten me on what worked best for you.

I have ordered AACN Essentials of Progressive Care Nursing and Critical Care Examination Review.

I was hoping to also order a study program and have narrowed it down to David Woodruff's PCCN Review or Laura Gasparis Vonfrolio's CCRN Study Review.

I had read in some postings, that there is a difference between studying for the CCRN and PCCN. I have heard only good things about Laura Gasparis Vonfrolios review. Do you think her review is OK for a PCCN study guide.

Thank you in advance. Any help would be greatly appreciated.