How/what should I study…

I signed up for the December SAT about a month ago, and to be honest, I haven’t studied at all. I procrastinated, thinking I would study every day, but I didn’t because all my AP classes are already making me stay up until 1 a.m. I know I shouldn’t expect to get a good score, but I’m a junior, so I still have time. With the test only a week away, what do you guys suggest I study?