Chance me: minority applying for BS

I’m a 9th grader from a small Southeast Asian country applying for a G10 boarding school.
Studies at an International school, and here are the schools I’m interested in applying :

  • Exeter, Andover, Hotchkiss, Deerfield, Milton, Groton, Choate, Blair, Middlesex, Berkshire, Mercersburg, Culver
  • All girls: Dana Hall, Madeira, Westover, Woodland Academy of Sacred Hearts

I need a full financial aid grant from the school. My sister is a current student at Milton that got admitted last year. prep

STATS:
PSAT 8/9 97th percentile, current year GPA 4.0
I had a C+ and a few Bs in electives for g7 & 8, core subjects are all A+ and As though

EC’s
Student government arts & entertainment chairperson
Designer + executive at rural development club
Executive + lead design team for the school’s newspaper club
Painted murals and paintings for the school library
Volunteer teacher at a war refugee orphanage for 1 year
Interested in civic action, art, journalism
110 hours from volunteer school paintings and 90 for student government
I did art for 9 years

Awards

  1. Immerse education Essay competition: admission and 30% scholarship to study at Cambridge/oxford summer engineering program( Top 7% entrants )
  2. “Debate: World Scholar’s Cup 3rd place top debater award (1 of 3 out of 900 participants); state representative and winning team in debate showcase
  3. International School Sports Association of my country logo contest winner, logo used in trophies, school websites, flyers, etc.
  4. WSC regional round 7 medalist+qualifer, Bangkok global round 8 medalist+qualifier
  5. American Mathematics Olympiad Bronze Award
  6. Math and Science: Academically prepared learner award
    10)Art top student winner
  7. Student of the Month x4 times
  8. School Science Fair Winner

My school does not offer advanced courses, but I self-study Algebra 2 and Trigonometry by myself.

I want some tips on essay writing, chances of my acceptance, and financial aid. Thanks so much for your time!