Testing Schedule??

<p>As of now I have a 31 on my ACT and a 2080 on my SAT. I have only taken the SAT once, but the score seems to match up with my ACT. Senior year is approaching, and I'm not sure if I should take both again, and if so, when. I am going to take the ACT again in September, but can I take it in December too? And I also want to take Subject tests, which I have never taken before, and I know I can't take those on the same day as the SAT. How exactly should I organize which tests to take?</p>