Should I take the SAT again (even after I've applied to college)?

I'm a senior in high school, and over the winter break, I applied to seven colleges (Boston University, Barnard College, Columbia University, Northwestern University, Bard College, University of Southern California, and the University of Texas at Austin). I have taken the SAT three times, and the last time I took it (December 2nd, 2017), I scored a 1420 (780 on the reading section, 640 on math). I know it's not terribly high, but I applied as a fine arts major at all of my schools (theatre arts, specifically). Should I even worry about taking the SAT after the fact? The reading section has always come very easily to me, but I've struggled with math for the longest time, and I really want to try and conquer it. But then again, I also think it may be just too much effort for what ultimately may be too little reward. Please help!