Hello, Most classes I've seen are pretty silly. Why not try sitting for an excel certification? I think it's called MS Excel Specialist and there is also a Master Specialist. Some caveats though
1 - For the basic certification you'll need to show you can do the standard excel tasks (cut, paste, basic formulas etc.)
2 - The master certification is pretty advanced, and focuses on things like pivot tables, advanced charting etc.
3 - No one seems to take the certifications seriously except for other excel geeks. Also, I think that listing an excel certificate on your CV might not be very beneficial as everyone assumes you know it already.