How to Report ACT if already submitted Common App

<p>So I sent my June ACT scores to all of my colleges, and I am retaking the ACT tomorrow. However, I already submitted my Common App to all of my colleges without mentioning that I will be taking the December ACT. </p>

<p>So obviously, if I got a better score, I’d just resent my scores. However, if I got a worse score, is it okay to not report them (to colleges who require all scores) with the excuse that I already submitted the Common App? Is there a way for them to find out? I’m not trying to cheat the system or anything - it’s just that I don’t feel like paying $10 to send a useless test score to every college.</p>