Self-Study AP Lit/Subject Test?

<p>So I'll be a junior, and my school only allows juniors to take AP Lang, and seniors AP Lit. I really like Vassar College, and they require 2 subject tests in different areas. I took the US History one my sophomore year, and got a 750, and am struggling to identify another one to take. I could take the World History one, but that's in the same area. I'm really REALLY bad a science, and I won't be taking a high enough math this year to take any of the math subject tests. I was thinking may the Lit one, because I'm good at English. Does anyone know how much taking AP Lang will help me with the Lit subject test? I'm going to ask my English teacher, who knows me well and will probably be helpful in gauging whether I would be fit for it, but what do you think? Also, if I just get a like, a Barron's book, how much will that help?</p>