I have a D15 (sophomore in high school) that has had testing a few times over the years. Benefits from testing for us have been:
- My D is very strong verbally like yours, but an absolute disaster organizationally. Testing revealed that she has a non-verbal learning disability, which has helped get some accomodations (extra time on math tests, more support from teachers with organization while she works on those skills).
- Good test results helped us get an entree into some online communities for gifted kids. Given how few kids there are like her in our community, that was a godsend in middle school. She is still close friends online with a few of those kids, and met one person in our city that she sees sometimes.
- She also took the SAT through the Midwest Academic Talent search in middle school, and we were able to use that score for her to attend Davidson's THINK. Which she LOVED. I am not sure how they treat a SAT score taken later, though. You would want to look at the THINK admissions info for that, an IQ score or some other test might be better. THINK is available until they are 16, so that is something to consider.
- I can't say that my D's IQ test results are really driving much from a college perspective. Except I guess that we KNOW she can do the work anywhere (if she just will - hah). We expect that she will take honors/AP classes in high school, but we expected that from her older sister as well (who is smart, but not in the highly gifted range).
- Not sure what benefit you will get from her taking the SAT now. She would retake in her Junior year anyway for college. A lot of people do have their sophomores take the PSAT as "practice" prior to the PSAT fall of Junior year (when it counts for National Merit). If she takes PSAT as a sophomore, you start to get a flavor then for her possible scores and it helps you start to think about what colleges are possible.