What's this Western education system of which you speak? Among Western nations the US is unique in how much emphasis it puts on extracurriculars and character. We know why that is too. The system arose as a smoke screen around Jewish quotas. The overwhelming majority of universities admit students on the basis of results of blind marked exams and nothing else. I'm by no means an expert but the usual examples given of exceptions, Oxford, Cambridge and ENA are looking for academic brilliance, not aristocratic polish ("well roundedness").
Western systems vary a lot in their degree of specialisation too. By 16, after the GCSEs the UK is done with being a generalist. Pick 3 or 4 A-Levels of your choice and if you feel like doing Math, Further Math and Physics or three sciences and Maths no one will stop you in the name of "well roundedness".
Western systems vary a lot in their degree of specialisation too. By 16, after the GCSEs the UK is done with being a generalist. Pick 3 or 4 A-Levels of your choice and if you feel like doing Math, Further Math and Physics or three sciences and Maths no one will stop you in the name of "well roundedness".