You'll need to have at least two years of rehab nursing experience before you can sit for the CRRN exam. In the meantime, you could work on getting your BSN. In the long run, it would benefit you more to have your BSN because that would open many more doors for you as opposed to the CRRN certification which of course is only specific to rehab nursing. I received $1 more per hour when I got my CRRN certification. Many healthcare facilities are wanting nurses with their BSN and should you want to go into certain specialties such as case management, supervisor, etc then a BSN is pretty much the standard. If you're still in rehab nursing two years from now definitely go for your CRRN though too because your facility might even pay for you to get it (mine did).