New York University requirements?

I live in the UK and want to apply to NYU when i finish sixth form. I have almost finished my GCSE's and am on track to getting A's / A*'s in all my subjects (inc. maths, science, spanish, english and history among others), what subjects will I need to take in sixth form if i want to apply to CAS at NYU, we can pick 4. Also would I need to take a SAT test or just submit my A-Level's / GCSE's grades, it says if your scores are independent from the school they can be used instead; do a-levels and gcses count?

Thanks.