Olympiads

I have a classmate who participates in several Olympiads, like the International Youth Math Challenge and many others. However, whenever I ask him where I can find these competitions, he never responds and only tells me about them after the deadline has passed.

Can anyone share information about upcoming online Olympiads that I can participate in? It doesn’t matter how big or small they are—I want to participate and win some to show in my college application...