What're the chances my SAT II MATH II was scored incorrectly?

<p>Could you let me know what prep book is the best to study for the Math IIc? I have used the barrons, but got a 690. I want to get in high 700's. Any test prep centers you could suggest will also help.</p>

<p>barrons is the best for math subject level 2. </p>

<p>i got a 790 using barrons and even scored a 700 on one of their ten tests (i averaged 760-780 on the other 9).</p>