Advice for when to take the SAT

<p>I'm a sophomore and am taking the SAT tomorrow. I know that if I take it again, I can make my score better. I didn't study as I should have (crammed everything in a week) and am only taking the test in order to get into a prep school. Should I go ahead and study for the SAT my sophomore year and take it around March-June or wait until my Junior year? I was thinking that since I am already in SAT studying mode, I could just keep going and take the SAT. So, in my junior year, I can worry about the ACT.</p>