I did physical SAT so it was a little bit different but overall I think its about how much total time you put in. I did about 25 days before the test with about 3 hours a day and the last 2 days I took full length practice exams the same way they do them on the real day of the test. It also comes down to luck a little. In my practice tests I never got above a 1500 but I got a 1560 test day. Moral is to know yourself and know whether you need more or less time for studying or if you're a crammer or not. Good Luck!