If you take the test multiple times, they use the highest score from each individual test. So for example the first time I took the SAT I got a 640 in math and a 680 in verbal. The second time I got a 610 in math and a 700 in verbal. So my combined score was 1340 because they kept the higher math score even though I got a lower score in math when I took it the second time.
Therefore, it's good to take the SATs as many times as you can because if you ever do worse it won't be held against you. You could even consider the first time to be for practice. Or, you could prepare for a different subject each time and ace them all individually.
Yeah, I know about superscoring and I'm thinking about taking it again. Second time I did better and improved significantly in math. Although, I think I might focus on the critical reading and writing section.