In middle and high school I participated in many math competitions. In 2016 I cofounded Contest Math Tutoring. My favorite competition math books at the pre-olympiad level are Art of Problem Solving's Counting and Probability series. My favorite book at the olympiad level is *Problems from the Book*.

Olympiad problems I've written for USA team selection tests, in increasing difficulty order:

Some math olympiad handouts I've made:

Compilations of some of my favorite mathematical gems:

Here are some of my own math competition results.

- First place on 2014 Putnam Exam.
- Gold medalist at 2013, 2014 International Math Olympiads.
- Top 12 winner at 2011, 2013, 2014 USA Math Olympiads.
- National Champion of 2010 MathCounts.