<p>The SATs should be offered once a month where you are (or at least once every other month). I took my SATs twice-- once in January (I think) and once in March. You have to wait 30 days to get your score after you take the exam, but then you can sign up for the next available test date if you like (which is what I did). I would recommend taking the SATs no later than spring of junior year or early into the summer after. If you are worried about your GPA you will want to apply in the summer before many applications have been put in.</p>