Ideally, attempt the SAT in Grade 11 (after boards settle), giving yourself time to retake it in early Grade 12, if needed. Most merit-based international scholarships expect a score of 1450-1550+, while full-ride scholarships at top schools are highly competitive and require 1500+ alongside a strong overall profile. School grades do matter, you must aim for 90%+ consistently. For specific details and insights, kindly visit the website of your preferred universities.