I would think that just sitting in wouldn't be enough for most parents to subsequently prep a kid to the level needed for a gifted level score. You would need to remember all of the questions given orally as well as be able to generate all of the printed material for the tests that require it.
Exactly. This was exactly my experience. There are what... 8 to 10 subtests? Many of the them visual and paper and pencil - you'd have to take a picture of the block design the child was suppose to reproduce or take a picture of the picture presented for picture concepts. I mean really. And I couldn't write any questions down - the testers could see me (plus they had me filling out forms). It's really not what people seem to think. As someone who has sat in while her child was being evaluated I find it really silly to think that one would be able to effectively cheat that way...
