Should I focus on the ACT or SAT?

<p>On the ACT I got a composite 29.
English: 32
Reading: 31
Math:27
Science: 27
Essay:6</p>

<p>On the SAT I got a 1730.
Critical reading:640
Writing: 580
Math: 510
Essay:8</p>

<p>I didn't study for either one. The only thing I did better on the SAT was the essay.
I already registered for the December ACT, should I take the SAT too? (I'm a Senior.)</p>