MOS 2007 Preparation Training Software

Does anyone know of any training or testing preparation Programs that may are available now for MS 2007. Certiport will not be avialable until May 2008 and SAM 2007 does not work.

I teach high school and part of their curriculum is to get MOS certified on MS 2007 Word, Excel and Powerpoint by May 2008.

Thank you
Howard S.