Lol some of the 'suggestions' put forward here are so ignorant I just had to write something. To make a competitive application, you should aim to get at least 5 APs in relevant subjects with 5s. Cambridge couldn't care less about extra curricular if they are not relevant to your academic subject. There are also 'admission' tests, like TSA etc, that would depend on the subject you want to study in. If you have any queries send me an email and I'll try my best to help. And just looking through their website will help heaps. And American universities, aren't at par with Cambridge, unless you are talking about Harvard and the likes. And Cambridge tuition fees are nowhere near the tuition fees at the American unis. Being an international student, it would cost me over US$200,000 for me to get an UCLA education, whereas I'd get a far better education at Cambridge/Oxford/UCL/LSE for about US$80,000.