What are my chances of getting into Andover, Lawrenceville, Exeter, and Milton?*Do I have any hooks?

*listed in the order that I want to attend

NOTE: My interview is next week so please leave any tips/ways to prepare!!! Also, what kind of personality are boarding schools looking for?

Info:
Applying for 9th grade (2018-2019), boarding
I’m from California, so I don’t think many people at my school are applying. I attend a public school, and I am applying to a local private school and a charter school. I got into the private school and charter school for middle school but decided not to go. I may apply for financial aid.

Grades:
Last year: all A+s
This year: All A+s except for two As
I skipped a grade in math, in honors english. Elective: chamber orchestra (highest level)
Clubs: in the science bowl team

SSAT: overall=99%
RC-99%
Vocab-95%
Math-99%

Recommendations:
Math: I think it’s pretty good. I don’t have access to what she wrote, but she promised a strong letter and I participate regularly in her class discussions.
English: She said she will write a good letter, and she wished me luck on my admissions.
Counselor: I talk to her, and she sent me her letter.
Personal/special interests: music teacher

EC:
I play the viola, got 2nd and 3rd place in a international competition this summer. First chair in an All Southern orchestra, multiple honor orchestras, in school orchestra. First chair in the local orchestra for two years
I play tennis, on a tennis team, won tournaments. I had a severe concussion from tennis and I am writing about it in my essays
I am creating an app about carbon emissions (Paris Accord)
Won a photography contest
I’ve been a girl scout since first grade. I’ve held camps for younger girl scouts, done beach cleanups, went to google, etc
Last year, I mentored other orchestras with violists younger than me.
I am on the school’s math and science olympiad

Essays:
I am writing them now, I’m almost done with the Andover essays, and I’ve started the Lawrenceville essay.