Spanish - REA or Peterson's??

[markus_amongus]

I've taken both Peterson's and REA practice tests, and there is a HUGE discrepancy between the two. The Peterson's tests are pretty basic, whereas the REA tests are very difficult for anyone who isn't already fluent. My scores have been around 73 (86%) for Peterson's, but only around 50 (43%) for REA. Does anyone know which one of these practice tests more accurately represents the real Spanish CLEP? I'm hoping to take the test soon in order to qualify for a Peace Corps position, so any advice would be greatly appreciated.

Thanks!