Common App Planned Test, But Will NOT Be Taking

<p>So on my Common App and all my other apps, I stated that I planned to take the SAT subject test on Physics in January 2011. However, after much preparation and studying, I have realized that I am not adequately prepared to take it and rather not take the test. How should I approach with this situation? Should I notify all my colleges individually about my change in plans? Or will they simply assume that since I didn't report it, I decided not to take it? (Note* This SAT Subject Test is purely supplemental, I have already satisfied all the testing requirements of all my applications, hence the SAT Physics was simply to brighten up my application)</p>