You will submit your predicted A level scores when you apply- For clarification you should state that you attend a British school, whereby, you don't have a high school transcript. If you took the IGCSE's you should submit them as well.
Make sure to answer this question on the common app-
International applicants: Is promotion within your educational system based upon standard leaving examinations given at the end of lower and/or senior secondary school by a state or national leaving examinations board?
Please view the expert's profile and feel free to directly message or email for paid guidance. ChanceMe.in will not get involved or require a cut for paid engagements between experts and students.