Should I cancel th SAT Subject Test score

<p>The thing is, I took the test today and I knew I did a bad job once I submitted the paper in...I registered for two tests which were Math II and U.S. history, BUT, I only took the Math II for whatever reason is. And I am preparing ACT pretty good so far, at least better than the SAT, do you guys see me to cancel the SAT subject test score and just send the ACT with writing? cuz even I get lucky, did not do as bad as I thought, I only would have one subject test score, which won't have much uses, and may even make the evaluator underestimate me...</p>