I built a tower with the WAIS blocks
I can understand not practicing with people trying to answer legitimately, but I'm not sure I see where the harm could come from practicing with classmates who are not trying to answer honestly. Obviously if one of my classmates asked for a LEGITIMATE assessment, that would be a different story. Though any information would probably be invalid anyways.
I guess you might be able to make the case that the projective tests can't be "faked" but I'm in the camp that believes they don't typically provide valid information anyhow
Out of curiosity (and don't think I'm attacking you or your program) - what is the alternative? Do they bring in outside volunteers? I guess the MMPI doesn't matter since its kind of hard to screw up "Fill in the bubbles, see you in a bit", but something like the SCID or WAIS needs to be practiced before doing it on someone...I'd find it far more ethically questionable to administer the WAIS on a client having never given one before than to do it on a classmate who isn't trying to provide legitimate information.