Rn-bc pain management certification

Wondering if anyone here is a Rn-bc in pain management. I will be coming up to my 2 years and work on a ortho unit. I was thinking of maybe doing the med/surg certification but I am not sure if i will stay in med/surg. I am interested in pain management and recently saw that you can take a certification for it.

anyone follow a study guide that would help me? I will be hitting my year 2 as a full time RN in January. Thanks in advance