As most of the long-time posters on this forum know, I am an evaluator myself. I certainly would have no problem with a parent informing herself about the names and general applications of tests. And I would be happy to discuss the pros and cons of different instruments, and explain my philosophy and process of test selection. If I were concerned about prepping, I would have a conversation about how tampering with student results (such as by prepping or actual cheating) takes away the opportunity to truly understand who a child actually is, and how they learn best. Not only is this a pretty significant loss in general, but it also may result in placing them in situations where they are likely to experience unnecessary failure and frustration. What parent would knowingly do so, when that could have been avoided if we had had an accurate understanding of what was in their best interests?
Besides, how does she know that parents who don't say anything about the name of the test aren't also prepping their children for the test? In any case, short of having an (illegal) copy of the test answers, prepping is minimally effective. If your most realistic option is to go through the schools, and they are required to administer an alternate assessment, I would consider speaking to her supervisor, inquiring as to whether what she said is a district policy (!), and then likely requesting that someone else in the district administer the WISC.
