If the point of the tests is to check for natural apptitude, I can't see that any amount of practice could alter the result-ie you have it or you don't. I could see such a program being a help but only so far as knowing what to expect and helping the candidate to relax, I don't think you could alter the result to any noticable extent no matter how much you practice.
I for one would welcome it, and can't see it being any harm, but someone like WWW would be able to give you definitive answers-he seems to know all about this type of thing.
Eno