What are my chances...with the ACT?

<p>So I'm a junior who's planning on taking the SAT sometime soon. I've heard about the ACT but I'm not sure whether to take it. I've never taken the SAT, except when I was 12 and I got a 1260 (700V, 560M). Since then I've taken the PSAT, in soph year, I got 80W, 71CR, 64M (the math score was insane, I'm actually not bad at math. I got a 78 after taking the practice test honestly this year. We'll see what the new score is.) Anyway, why take the ACT? Who should take it? I heard it's good for "people who perform better in the classroom..." but what does that mean? I get good grades but I'm "good" at standardized tests too. BTW my best subjects are history and english. And I'm also aiming for UPenn, so assuming I get a 2200ish on the SAT (which looks likely if you consider my old PSAT score), is it worth it to take the ACT instead?</p>

<p>Don't take the ACT, nice predicted SAT scores, if you get them!</p>