Take the SAT 1-2 more times to try and get those scores up. In some cases focus more on the sections that you recieved the lowest score. For instance if a person got a 740 in math but around 600s in writing/verbal, the next time they take the SAT don't stress about the math section. Use it as a break.
I did this knowing the scores would be superscored, and it worked out pretty well in the end. Obviously I did more SAT prep for the sections I wanted to improve, but I would still take the ACT any day of the week over the SAT.
So lets say you do use this method, and a person's writing/verbal goes up to about the 670s, but math goes down to the 690s. That is the beauty of superscoring.
You take the 670s from the second test, but the 740 from the first test, giving a score of 2080.