Although there is not an actual review course several options exist. Look under Practice/Prepare tab to download the free Certification Preparation Guide which offers sample test questions with answers and the option to pay to take the Online Practice Exam.
A "Nurse Practitioner Exam Review" was offered as an NKF Preconference option April 10, 2018. It included test construction, item review and audience response with exam question review and rationale. A similar presentation was given at ANNA's 2014 Fall Meeting (available via ANNA ProLibraries).
These options have been prepared by CNN-NPs and approved by NNCC's Advanced Practice Exam Board.
Online one can find "review courses" for nephrology NP’s preparing to take the CNN-NP. They are; however, put out by generic test review companies that have no connection with NNCC and we cannot recommend any of them as a preparation for this test.