Here are the handouts I’ve written for talks at various math camps.
Canada Winter Camp:
Canada EGMO Training:
York University CMS Math Camp:
- Power of a Point - York University CMS Math Camp 2017
- Invariants and Monovariants - York University CMS Math Camp 2016
UTS Senior Math Club:
- Probability States - UTS Senior Math Club 2017
- Linearity of Expectation - UTS Senior Math Club 2017
- Vieta’s Formulas - UTS Senior Math Club 2017
For other math contest handouts, I recommend:
I was also an OTIS instructor for a few years. However, I no longer tutor students — teaching is fun, but time-consuming. I still recommend OTIS to any high school students trying to improve at math olympiads (but you should know that having a tutor is neither necessary nor sufficient to do well, and I think the practice you do when no one is around to teach you is far more important).