You’ve probably heard that math competitions can “boost your college applications,” but figuring out which ones are actually worth your time, especially online, can feel overwhelming. Between different formats, varying levels of prestige, and unclear eligibility rules, it’s not always obvious where to start or what will genuinely help you stand out.

Winning at the International Science and Engineering Fair (aka ISEF) is arguably the most prestigious and competitive scientific accomplishment that you can aim for at the high school level. However, Regeneron ISEF can be difficult to understand, given its complex structure. From multiple qualifying fairs to neverending forms to deciding what category to compete in, there are thousands of ways to approach ISEF. In this guide, we will help you understand this mammoth compet