Chances and advice

<p>Hello,
I am a science student of class 11 (CBSE) from India.I want to do Bachelors in Fine arts from Yale, RISD,Pratts or chicago. I got a 9.8 cgpa in class 9 and 9.4 in class 10.My half-yearly exams are coming and i know pretty well that i will do very bad in them... since i am not prepared for it. But all my school life till class 8 i have got about 95%. I want to know how much should be my grade in class 11 and 12 to get into these colleges with a scholarship? When should i take my SAT's and what should be my scores in it?
P.S.-I am really good at fine arts. And pls Xplain me a bit about the SATS</p>