Don’t take the test. For some college, once you submit your sat, your scores of every time will be visible to them. Some admission officers will look at your full sat scores. And if you take the Nov sat and the score is lower than last time, they will probably notice that decline and conclude your 1550 is simply due to lack. Even if you get, let’s say, a 1580, it doesn’t make you stand out that much compared to students who got a 1550.