Applying to Yale as a Freshman International Student
You have to do the SATs, but not SATIIs (your A-levels will count for the latter):
SAT Reasoning Test
Apart from grades, you'll need excellent SAT scores and A-levels results, commitment to one or more extra-curricular activities (a sport, a club, community service, etc.), sterling teacher recommendations and a very strong essay. And a fair amount of luck - the acceptance rate this year was 7.5%.