I don't think SAP is offering any course to get SAP 4.7C certified. Everything is moving towards WAS 6.20, and so are the available certifications.
I suggest you try to get access to WAS 6.20 material/system and spend few months on that - and invest the money of 4.7C certification cost towards much latest WAS 6.20 certification. It would help you much more in the long run - rather than taking 4.7C now (just a personal suggestion). If you don't have access to WAS 6.20 yet, still don't worry about taking 4.7C as the weightage 4.7C will get from the client won't be that much in terms of roles or perks.