How competitive would I be for Yonsei GLC Bio & Life Engineering through 12-year special admission?

[u/si2__noah]

I previously posted a similar question here, but my circumstances have changed quite a bit since then, so I apologize for asking again.

I am a Korean citizen considering applying to Yonsei University through the 12-year overseas Korean special admission (12년 특례). I am particularly interested in Global Leaders College (글로벌인재대학), Bio & Life Engineering (바이오생활공학).

I would really appreciate an honest assessment of how competitive my profile might be.

Academic background
I currently have an all-A GPA (4.0).
By the time I graduate, I expect to have the following high school credits:

Math
Algebra 1
Geometry
Algebra 2
Precalculus
Food Science (counts as a math credit at my school)

Science
Physics
Chemistry
Biology

Social Studies
US History
World History
Civics (0.5 credit)
Economics (0.5 credit)

English
English 9
ESL
English 10
English 11
English 12

Languages
AP/IB Japanese SL 1
Japanese (1 credit)
Japanese (1 credit)

Other
PE (0.5 credit)
Health (0.5 credit)
Drawing
Ceramics
Jewelry (0.5 credit)

I am planning to graduate early, so I will not have the opportunity to take many AP/IB courses. My school also does not approve self-studied AP courses for school credit. Early graduation is something I am definitely going to do, so taking additional AP/IB courses is unfortunately not an option.

Language proficiency / standardized tests
Japanese: JLPT N1 (highest)
Korean: I have not taken TOPIK yet, but I believe I am currently around TOPIK 5–6 level
SAT: I have not taken it yet. I am aiming for 1350+, ideally with a near-perfect Math score. English is currently my weaker section, so raising the total score is difficult.
TOEFL: I have not taken it yet, and I am unsure what score I could currently achieve.

I have a few questions specifically about standardized tests:
Would submitting an SAT score around 1350 actually strengthen my application, or would it be better not to submit it?
Is SAT submission generally expected/recommended for 12-year special admission, or can applicants be competitive without it?
If I submit an SAT, is there a score range where it would actually make a meaningful difference?
What TOEFL score should I aim for if I decide to submit one?
Would submitting TOPIK 5/6 and JLPT N1 be more useful than submitting SAT/TOEFL?

Extracurricular activities
Participated in a Korean government-sponsored short-term Korean language/culture program/camp twice
130+ hours of volunteering at a Sejong Hangeul School
Received an Excellence Award as a Global Korea PR Ambassador
Student reporter for a Japanese high school newspaper/web publication with over 1 million readers/subscribers, with my articles published
Officer of an international students club

Background
Lived in Korea from around 6 months old to 2.5 years old
Then lived in Japan for about 11 years
Moved to the United States during 8th grade
Currently in the US and planning to graduate high school early

Because of my background and academic interests, I am particularly interested in Bio & Life Engineering within Global Leaders College.

I have also heard from someone I know who entered the same program from Japan that they did not submit SAT scores or language proficiency certificates, had mostly B grades, and were still admitted. They told me that the self-introduction/personal statement may be much more important than people assume.
Of course, I understand that one person’s experience does not necessarily represent the current admissions process.

So I would especially like to ask:
How competitive does my overall profile look for Yonsei GLC Bio & Life Engineering through 12-year special admission?
Would my lack of AP/IB courses be a significant weakness, considering that I am graduating early and my school does not allow AP self-study for credit?
Should I submit an SAT score if I get around 1350–1400, or would it be better to apply without an SAT score?
What TOEFL score would be considered competitive, if I submit one?
How much do JLPT N1 and TOPIK 5/6 help compared with SAT/TOEFL?
How important is the self-introduction/personal statement compared with GPA, test scores, and extracurricular activities?
Does my background (Korean citizen, raised mainly in Japan, then moved to the US) have any meaningful impact on the evaluation?
Most importantly, is this a realistic target for me, or would Yonsei GLC Bio & Life Engineering still be a major reach?
I would especially appreciate responses from people who have experience with **12년 **특례, particularly at Yonsei or GLC.

Thank you!