I disagree ^^ I think an aptitude test is a good tool for helping identify strengths and paths your average 17 or 18 year old might not think of. It's just one more piece of information. You don't have to take the results as gospel. And if it shows a kid has less aptitude for a career or area they want to pursue, it really just tests how deep their interest is. If they still want to pursue it, you know you have some strong motivation there.
I thought FCPS high schools were having kids do more aptitude and interest related tests.