COC vs. CASCC certification

I am looking at getting certified. My boss ordered me the materials and practice tests for COC certification and paid quite a bit. I realized today there is a Specialty Certification for ASC's (CASCC) and was talking to her about it.

My question is from anyone else's experiences, first of all do you have to be COC certified before becoming CASCC certified, and if not, instead of ordering a new set of books for the CASCC do you believe if I practice off the COC certification that I will be prepared for the CASCC?

Thanks for any input!

COC vs. CASCC certification