How Many SAT IIs should I take??

<p>Hi! I'm a Junior, currently registered for SAT IIC and Physics, and future Wharton hopeful. Should I take another Subject Test and preferably in what subject?? Also, I attend an A-level (British curriculum) school and my subjects are..Maths, Physics, Economics and French but I'm not too keen on doing SAT II French, will Biology/ Chem be ok? Or is English Lit better?</p>