SAT Help! Should I take SAT's December?

<p>So ACT is a state requirement so we get those free on April. I want to take the SAT earlier than that around Dec. to evaluate my progress from studying 3 SAT books so I can join Vanderbilt Summer Sessions. Do I get another shot at retaking SAT's April or June? I feel that I might have room for improvement after December. I dont want to turn in crappy SAT scores in a year.</p>