Yeah, I think that for most kids who qualify through talent searches, a few full-length practice tests to get used to the format and sheer stamina needed (at 8-14yo, that is DEFINITELY a factor with the SAT) are a good idea.
Beyond that, it's prepping. I disagree with prepping. Others don't.
There is a little point to doing a "few full-length practice tests" unless you look at what you missed and learn what you needed to know to answer the questions. That is "test preparation". Being realistic about your strengths and weaknesses and trying to fix the latter is an important skill not just for the SAT but for life.
