No second thoughts on my answer – study and take boards again. How about you enroll yourself to a better board review school/institution and concentrate on the review. Since you’re out of school for 3 years already, I assume you are working now. Maybe it’s time to concentrate and focus on your review so you’re not too pressured and stressed.
Take the boards again. Better yet, see if you can determine where you need to improve and how you learn best. Most importantly, never give up; learning to survive setbacks is core to learning to be successful. No great acts are made without imperfections or difficulty–that just life.