Do you mean you want to enroll full time at a UK school, or do study abroad through a US school?
These are really the only bits that count on a UK application, and the other grades as well but less so.
Quote:
Academics:
GPA: 3.8
SAT: 2020 (math :740
critical reading: 620
writing: 660
11th Grade: (IB) (out of 7)
PHYSICS HL 7
MATH HL 7
BIOLOGY HL7
ENGLISH SL 6
SPANISH SL 6
HISTORY (European) SL 6
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It's one common app. so any grades you put on the UCAS form will be seen by all the colleges you apply to.
UCAS Home Page
You know that you MUST apply for a specific subject in the UK, right? In which case the grades of that subject and related ones are most important. I am assuming you are interested in sciences because you are applying to Imperial. You should check the web-sites of these schools to see the grades they require. SAT IIs in math/physics/chemistry/biology might be helpful. But not essential since UK schools love IB. Usually the minimum IB score for Oxbridge is 38, but I have heard of "conditional offers" asking for 40.