<p>I indicated on my application that I would like to major in chemistry. I decided later that i would rather major in math. Is it a good idea to notify them before my app is reviewed? Or should I wait on my decision before changing things?</p>
<p>Wait until you matriculate. It's unnecessary to notify them of the change as only in a few instances does major matter, and your case is not one of them.</p>
<p>Don't bother, most colleges don't have you choose a major until end of freshman year at the earliest.</p>