<p>If you’re good at science, the olympiads are very good. USABO, USNCO, and USAPhO are the most well-known. For math, the USAMO series, ARML, Harvard-MIT Math Tournament, and Mandelbrot are good.</p>
<p>If you’re good at science, the olympiads are very good. USABO, USNCO, and USAPhO are the most well-known. For math, the USAMO series, ARML, Harvard-MIT Math Tournament, and Mandelbrot are good.</p>