When's the latest you can tell colleges about new achievements in the senior year?

<p>When's the latest you can tell colleges about new achievements in the senior year before they make their final decisions? (some specific colleges I'm curious about are princeton, harvard, and mit)</p>

<p>If you’re applying for this upcoming fall, you know that the Ivy decisions are being released today, right? Given that you should have some amount of reasoning skills, don’t you think that the reasonable time has already past (unless you become a WL person I guess).?</p>