Questions about STS and other research competition

<p>I wrote a research paper on math and I hope to participate in Intel's STS and other science research competition. But it seems that I am not qualified since I am a junior. My question is if I wait until my senior year, will it be too late since even semifinalists are announced in Jan. each year? Or could any of you give me some advice?</p>

<p>Try Intel ISEF.</p>

<p>Too late for what?</p>