If you fail an exam you will have to wait up to six months to reattempt the exam.  In the mean time you can be re-watching all the recorded video classes for the areas that you failed on at absolutely no additional cost to RNBP.   We also encourage you to participate in the live Q&A sessions to make sure that you are well prepared to take the exam again and pass.  (Note that you will have to repay the testing fee for that exam.)