That is a lot of tests!! Plus it seems weird that they wanted so many--I guess they're trying to limit how many kids get tracked?
The only reason we've had DD tested was initially because her teachers requested it due to her subpar social skills, so she got the SB-5 and later the WISC-IV. Then we realized she was gifted so we had her take the test to qualify for CTY in case that was helpful, but we haven't done any of their courses or anything. She also had to take the OLSAT for the admission package for a local school, and will need to take the ISEE this Fall for a different school. Plus our school district does end of grade tests in 3rd grade and every couple of years after that. But if we hadn't had other reasons for her to take the tests, I don't think we would have done any of them. She's doing well enough academically (for now) that I'm not worried about what her scores might end up being, although I'm sure she'll do some studying for the SAT when the time comes.